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Archive 1 |
how do i prove that a quadrilateral is a cyclic quad - Anon
Few rectangles can be 8 x 4 = 32. What? Does this make any sense at all ? --anon
There should be reference to the superclass object that includes all other dimensional "rectangles". I couldn't find what this was but have always thought they were called Boxes. A page for Boxes or n-dimensional rectangles should be made, or if it exists, again should be referenced.
Rectangles are a polygon. —Preceding unsigned comment added by 24.24.230.77 ( talk) 03:57, 8 October 2008 (UTC)
I always thought an oblong was a rectangle standing on its shorter edge, so it's higher than it is wide. For example █ - that would be an oblong but the shape of most flags is not. I'm probably 100% wrong though —The preceding unsigned comment was added by Jodamu ( talk • contribs) 15:25, 25 December 2006 (UTC).
. Yep, 100% wrong! :) I'm not sure about the relegation of the term oblong to a colloquiallism: an oblong rectangle is taught to be called an oblong (and a square rectangle a square) currently at UK primary school level. Rcrowdy
Mathematically speaking the properties of a rectangle make it the same as a square but when seen on paper they are different so is a square a rectangle or is it a different shape? I mean seriously people it is very interesting question the needs to be answered.
No a rectangle is part of the squares if Im not wrong. —Preceding unsigned comment added by 190.25.40.80 ( talk) 23:38, 7 May 2008 (UTC)
Tex23BM: A Square is in Fact a Rectangle. A rectangle is not however always a square. A rectangle's only defining attribute is that all 4 angles are 90 degrees. It is from this very key fact that all other attributes of the Rectangle are derived. Thus the front page NEEDS TO BE CORRECTED. —Preceding
unsigned comment added by
Tex23bm (
talk •
contribs)
18:21, 13 August 2008 (UTC)
Here's what's wrong with Nemo's 2008-08-18 definition, which I've just replaced. It is not the (in)ability of a rectangle to be partitioned into unequal squares which makes a rectangle (im)perfect, but the (non)absence of two equal squares which makes a squared rectangle (im)perfect. A rectangle can be squared perfectly or imperfectly if and only if its aspect ratio is a rational number. Also, the definition ignores the fact that 'perfect rectangle' has been used to describe tilings by isosceles right triangles (Skinner et al., 2000). Kinewma ( talk) 05:41, 16 October 2008 (UTC)
There are many definitions of "perfect rectangle". It is all in the eye of the beholder! Dbfirs 10:11, 15 February 2009 (UTC)
ur n lto l126520 oy,oly orty r;[p ,lplhot\oykhyo kyllyyokyjy
, yry;j
5012470 kgkgl 5012470 i ir ity,l0y 5012470 l kt , h 520180 jti jkti m j khtm, vg kg' —Preceding unsigned comment added by 219.77.0.238 ( talk) 11:56, 15 February 2009 (UTC)
A perfect rectangle may refer to the golden rectangle, or to a rectangle partitioned into similar polygons all of different sizes. 5012470 —Preceding unsigned comment added by 219.77.0.238 ( talk) 13:01, 15 February 2009 (UTC)
Italic textIs a square a freakn' rectangle or not?????????? —The preceding unsigned comment was added by 86.16.227.111 ( talk) 18:59, 31 January 2007 (UTC). i dont think we can say rectangle as square. —Preceding unsigned comment added by 202.156.12.12 ( talk) 04:44, 20 January 2008 (UTC) There is another rule for rectangle apart from the corners being 90 degrees. The opposite sides must be parallel and also the same length. If they are not it is possible you have a parallelogram which is not a rectangle! —Preceding unsigned comment added by 194.152.88.66 ( talk) 10:06, 5 May 2009 (UTC)
Colleagues, if we are considering a polygon ABCD, then the corners at the picture are named in a wrong way, I mean C and D must be swapped. Anyone who has time, please correct the picture! DrCroco ( talk) 05:42, 5 June 2009 (UTC)
This is because there is no picture of a rectangle in Wikimedia Commons with the corners labelled in the standard way. The picture used is of a "Lambert Quadrilateral". Could someone add a correctly labelled rectangle to Commons, then we can correct the error by replacing the picture in Wikipedia? Dbfirs 06:57, 24 August 2009 (UTC)
definition of a rectangle is too general. Knowledge is power! 23:00, 23 August 2009 (UTC) —Preceding unsigned comment added by Fngosa ( talk • contribs)
It seems to me that the infobox on this page is unlikely to provide much helpful information for readers of this article. Would anyone mind if I were to remove it? Jim ( talk) 22:45, 18 October 2009 (UTC)
Okay, let's talk about this. It seems unlikely to me that the average reader of this article has any idea what a Schläfli symbol or Coxeter-Dynkin diagram (or even a symmetry group) are. Moreover, I expect that those readers who do know what these things are would mostly already know what the Schläfli symbol and Coxeter-Dynkin diagram for a rectangle would be. If you asked an average mathematician to list some basic facts about rectangles, I very much doubt that either the Schläfli symbol or the Coxeter-Dynkin diagram would be among the twenty most cited pieces of information. So what is the purpose of presenting this information so prominently in the article? Jim ( talk)
Wouldn't "equiangular quadrilateral" be a good definition for both simple and complex rectangles? Wouldn't that avoid "term.. refers to" when what is wanted is a comprehensive definition of the concept of rectangle? How about
Also: I think the diagram of the complex rectangle needs to come higher up in article.-- JimWae ( talk) 07:30, 22 April 2010 (UTC)
1> That seems sensible. Do mathematicians disagree over whether they "are" true rectangles?
2> "A rectangle that is not simple is complex" is 8 words to say not much of anything. "Shapes called complex rectangles <are also>/<have also been> considered to be rectangles" is 3 or 4 words longer but expresses that this nomenclature is a bit "unusual" (instead of making a proclamation)
3> I will not push this - but has there ever been a debate here about violation of WP:NOTDIC? I mention this because of the use of "term ..refers to" in the 1st sentence -- JimWae ( talk) 08:20, 22 April 2010 (UTC)
Another shot - trying to talk about rectangles rather than the word "rectangle"-- JimWae ( talk) 10:03, 22 April 2010 (UTC)
1>Is there anything in my proposed edit that altered the meaning? 2>Is there anything that needs referencing that does not already need referencing in the current lede? This is not my field, so [especially without more input] I am not the best person to do any referencing. 3>To help tighten the proposal further: Does one need to be non-Euclidean to include complex rects as rects? 3b> Is "In Euclidean geometry" essential to definition - or is it there to give context to the article topic? 4>angular "eight" (quotes around 8) -- from a resemblance to a figure "8", right? (not 8 angles) (Also an angular "∞") 5>"A complex rectangle has the same vertex arrangement as a simple rectangle" seems very unhelpful if meant as part of a def, compared to "self-intersecting equiangular quadrilateral". Could it be dropped in favor of the latter?-- JimWae ( talk) 18:50, 22 April 2010 (UTC)
This 2009-AUG-26 edit by Kinewma radically changed the lede. I think this was likely a complete misfire. Just because there is a shape that gets the name "crossed-rectangle" does not mean anyone considers that shape to be a rectangle - and there is no source for the claim that anyone does. Crossed rectangles are the shape of a wire-frame rectangle that has been twisted - they are no longer rectangles, just as one folded in half would no longer be a rectangle. The lede needs to be fixed:
I think we should also say rectangles are 2-dimensional plane figures (quadrilateral article does not seem to say that either - [but perhaps some include skewed quadrilaterals as quadrilaterals?]). We might also reinsert the "ABCD" way of identifying a rectangle-- JimWae ( talk) 19:25, 26 April 2010 (UTC) Btw, I also see usage of "skewed rectangle" - But in what ways it remains a rectangle I do not see.-- JimWae ( talk) 21:26, 26 April 2010 (UTC)
From while article:
While is used in British English also, so this is not just a matter of Eng-var. I see no reason to use terminology that needlessly makes the article seem archaic. Would anyone object if we dispensed with "whilst" in favour of "while"?-- JimWae ( talk) 03:00, 3 May 2010 (UTC)
I planned a new sentence anyway before reading this! I thought I was logged in. 87.114.116.129 was me (not a permanent url), but not for any previous edits/vandalism! Kinewma ( talk) 20:11, 3 May 2010 (UTC)
My understanding of the non-planar (or 3D) skew rectangle is that it is the shape that would be formed by folding a rectangular piece of paper along a diagonal. 2 angles are unchanged. The other 2 are equal, but they are not on the same plane as either of the other 2 & have to be measured in 3 dimensions. The only way I see they could still be right angles is if you fold the paper so the planes are perpendicular - but that is a special case.-- JimWae ( talk) 08:22, 5 May 2010 (UTC)
We need sources to prove or disprove my assumption that a skew rectangle is the result of folding a planar rectangle along a diagonal (I didn't think it could be anything else). If ABCD is a skew quadrilateral, with opposite sides equal and DAB and BCD right angles, then ABC and CDA are acute angles. (All angles are in 2D as any 3 points are coplanar.) Spherical rectangles exist (google 968 hits), but mathematicians do not regard any figure in hyperbolic geometry as a 'rectangle' - see Hyperbolic Geometry. —Preceding unsigned comment added by Kinewma ( talk • contribs) 23:54, 5 May 2010 (UTC) In spherical geometry a spherical rectangle is divided by a diagonal into two similar spherical triangles, but in hyperbolic geometry (according to Mathworld) there are no similar triangles. Kinewma ( talk) 00:22, 6 May 2010 (UTC) My mistake - hyperbolic geometry does have similar triangles, but just as in spherical geometry they are always congruent. Kinewma ( talk) 00:34, 6 May 2010 (UTC)
When mathematicians (not just source I gave) say there are no rectangles in hyperbolic geometry I think they just mean that there are no rectangles with 4 right angles. My skew rectangles are just bent rectangles! Skew rectangles having four equal angles (not right angles) sounds a plausible definition. Are the edges of a skew rectangle straight lines or arcs? If they are straight lines (AB, BC, CD, DA) then they and the rectangle's diagonals (AC and BD) are the edges of a tetrahedron in which AC and BD do not intersect so a saddle rectangle (a skew rectangle whose diagonals intersect) does not exist. Or are the edges straight lines but the diagonals arcs? Kinewma ( talk) 05:56, 7 May 2010 (UTC)
According to Stars: A Second Look by Michael de Villiers, "The interior angle sum of the crossed quadrilateral is 720 degrees. This is usually very surprising to children and adults alike." I wouldn't call a 'crossed rectangle' a degenerate rectangle. It's either a true rectangle (like a crossed quadrilateral is regarded as a quadrilateral) or it isn't a rectangle at all (which is what I've reluctantly edited the article to say). Kinewma ( talk) 04:29, 29 April 2010 (UTC)
A crossed rectangle is a self-intersecting instance of a generalized rectangle defined as any quadrilateral with the same vertices as a rectangle. Kinewma ( talk) 03:35, 30 April 2010 (UTC)
My thought now is that it is a subject better handled under crossed-quadrilateral since there's no dispute in that term, and there a statement can be made of different types, including crossed-rectangle, which alternates pairs of long and short edges like a convex rectangle, but doesn't have right angles. Tom Ruen ( talk) 05:19, 1 May 2010 (UTC)
Definition:
I'm puzzled as to how Michael de Villiers' definition of a rectangle: "Rectangle - any quadrilateral with axes of symmetry through each pair of opposite sides"
[1]can allow his "crossed rectangle" as a candidate. Can anyone explain his thinking?
Dbfirs
07:52, 3 May 2010 (UTC)
Regarding the question of whether the images shown in the Tessellations section of this article are isogonal: The article isogonal figure says: That implies that each vertex is surrounded by the same kinds of face in the same or reverse order, and with the same angles between corresponding faces. With the exception of the third image, it looks to me like that criterion is met. What am I missing? Duoduoduo ( talk) 20:05, 12 April 2011 (UTC)
Perhaps the original list was isogonal and then more were added? The basket weaves" can be seen as 2-isogonal, with two types of vertices, with 3 or 4 edges connecting them. The first, second and last are all isogonal. Tom Ruen ( talk) 20:31, 12 April 2011 (UTC)
1-isogonal | 1-isogonal | 2-isogonal | 2-isogonal | 1-isogonal |
---|---|---|---|---|
![]() Stacked bond |
![]() Running bond |
![]() Basket weave |
![]() Basket weave |
![]() Herringbone pattern |
it is often useful to have shapes similar to rectangles, but with rounded corners.
but what are these called? the often used "rectangle with rounded corners" is self-contradictory, since a rectangle is defined a something with straight sides which intersect at right angles.
JLW30
10:11, 8 January 2007 (UTC)
If you referred to it as a rounded oblong, that may make sense using the definition of an oblong as something longer than it is wide.
My friend from the Phillipines insists that an oblong is exactly that- a rectangle with rounded corners. In Australia we are taught that an oblong is a non-square rectangle. I think in common usage it may be fine to call a rectangle with rounded corners an oblong, but it is too ambiguous for mathematical usage.
A rectangle with rounded corners is called a "rounded rectangle", per this reference site:
http://mathworld.wolfram.com/RoundedRectangle.html — Preceding
unsigned comment added by
192.91.173.36 (
talk)
19:47, 8 January 2015 (UTC)
![]() | This is an archive of past discussions. Do not edit the contents of this page. If you wish to start a new discussion or revive an old one, please do so on the current talk page. |
Archive 1 |
how do i prove that a quadrilateral is a cyclic quad - Anon
Few rectangles can be 8 x 4 = 32. What? Does this make any sense at all ? --anon
There should be reference to the superclass object that includes all other dimensional "rectangles". I couldn't find what this was but have always thought they were called Boxes. A page for Boxes or n-dimensional rectangles should be made, or if it exists, again should be referenced.
Rectangles are a polygon. —Preceding unsigned comment added by 24.24.230.77 ( talk) 03:57, 8 October 2008 (UTC)
I always thought an oblong was a rectangle standing on its shorter edge, so it's higher than it is wide. For example █ - that would be an oblong but the shape of most flags is not. I'm probably 100% wrong though —The preceding unsigned comment was added by Jodamu ( talk • contribs) 15:25, 25 December 2006 (UTC).
. Yep, 100% wrong! :) I'm not sure about the relegation of the term oblong to a colloquiallism: an oblong rectangle is taught to be called an oblong (and a square rectangle a square) currently at UK primary school level. Rcrowdy
Mathematically speaking the properties of a rectangle make it the same as a square but when seen on paper they are different so is a square a rectangle or is it a different shape? I mean seriously people it is very interesting question the needs to be answered.
No a rectangle is part of the squares if Im not wrong. —Preceding unsigned comment added by 190.25.40.80 ( talk) 23:38, 7 May 2008 (UTC)
Tex23BM: A Square is in Fact a Rectangle. A rectangle is not however always a square. A rectangle's only defining attribute is that all 4 angles are 90 degrees. It is from this very key fact that all other attributes of the Rectangle are derived. Thus the front page NEEDS TO BE CORRECTED. —Preceding
unsigned comment added by
Tex23bm (
talk •
contribs)
18:21, 13 August 2008 (UTC)
Here's what's wrong with Nemo's 2008-08-18 definition, which I've just replaced. It is not the (in)ability of a rectangle to be partitioned into unequal squares which makes a rectangle (im)perfect, but the (non)absence of two equal squares which makes a squared rectangle (im)perfect. A rectangle can be squared perfectly or imperfectly if and only if its aspect ratio is a rational number. Also, the definition ignores the fact that 'perfect rectangle' has been used to describe tilings by isosceles right triangles (Skinner et al., 2000). Kinewma ( talk) 05:41, 16 October 2008 (UTC)
There are many definitions of "perfect rectangle". It is all in the eye of the beholder! Dbfirs 10:11, 15 February 2009 (UTC)
ur n lto l126520 oy,oly orty r;[p ,lplhot\oykhyo kyllyyokyjy
, yry;j
5012470 kgkgl 5012470 i ir ity,l0y 5012470 l kt , h 520180 jti jkti m j khtm, vg kg' —Preceding unsigned comment added by 219.77.0.238 ( talk) 11:56, 15 February 2009 (UTC)
A perfect rectangle may refer to the golden rectangle, or to a rectangle partitioned into similar polygons all of different sizes. 5012470 —Preceding unsigned comment added by 219.77.0.238 ( talk) 13:01, 15 February 2009 (UTC)
Italic textIs a square a freakn' rectangle or not?????????? —The preceding unsigned comment was added by 86.16.227.111 ( talk) 18:59, 31 January 2007 (UTC). i dont think we can say rectangle as square. —Preceding unsigned comment added by 202.156.12.12 ( talk) 04:44, 20 January 2008 (UTC) There is another rule for rectangle apart from the corners being 90 degrees. The opposite sides must be parallel and also the same length. If they are not it is possible you have a parallelogram which is not a rectangle! —Preceding unsigned comment added by 194.152.88.66 ( talk) 10:06, 5 May 2009 (UTC)
Colleagues, if we are considering a polygon ABCD, then the corners at the picture are named in a wrong way, I mean C and D must be swapped. Anyone who has time, please correct the picture! DrCroco ( talk) 05:42, 5 June 2009 (UTC)
This is because there is no picture of a rectangle in Wikimedia Commons with the corners labelled in the standard way. The picture used is of a "Lambert Quadrilateral". Could someone add a correctly labelled rectangle to Commons, then we can correct the error by replacing the picture in Wikipedia? Dbfirs 06:57, 24 August 2009 (UTC)
definition of a rectangle is too general. Knowledge is power! 23:00, 23 August 2009 (UTC) —Preceding unsigned comment added by Fngosa ( talk • contribs)
It seems to me that the infobox on this page is unlikely to provide much helpful information for readers of this article. Would anyone mind if I were to remove it? Jim ( talk) 22:45, 18 October 2009 (UTC)
Okay, let's talk about this. It seems unlikely to me that the average reader of this article has any idea what a Schläfli symbol or Coxeter-Dynkin diagram (or even a symmetry group) are. Moreover, I expect that those readers who do know what these things are would mostly already know what the Schläfli symbol and Coxeter-Dynkin diagram for a rectangle would be. If you asked an average mathematician to list some basic facts about rectangles, I very much doubt that either the Schläfli symbol or the Coxeter-Dynkin diagram would be among the twenty most cited pieces of information. So what is the purpose of presenting this information so prominently in the article? Jim ( talk)
Wouldn't "equiangular quadrilateral" be a good definition for both simple and complex rectangles? Wouldn't that avoid "term.. refers to" when what is wanted is a comprehensive definition of the concept of rectangle? How about
Also: I think the diagram of the complex rectangle needs to come higher up in article.-- JimWae ( talk) 07:30, 22 April 2010 (UTC)
1> That seems sensible. Do mathematicians disagree over whether they "are" true rectangles?
2> "A rectangle that is not simple is complex" is 8 words to say not much of anything. "Shapes called complex rectangles <are also>/<have also been> considered to be rectangles" is 3 or 4 words longer but expresses that this nomenclature is a bit "unusual" (instead of making a proclamation)
3> I will not push this - but has there ever been a debate here about violation of WP:NOTDIC? I mention this because of the use of "term ..refers to" in the 1st sentence -- JimWae ( talk) 08:20, 22 April 2010 (UTC)
Another shot - trying to talk about rectangles rather than the word "rectangle"-- JimWae ( talk) 10:03, 22 April 2010 (UTC)
1>Is there anything in my proposed edit that altered the meaning? 2>Is there anything that needs referencing that does not already need referencing in the current lede? This is not my field, so [especially without more input] I am not the best person to do any referencing. 3>To help tighten the proposal further: Does one need to be non-Euclidean to include complex rects as rects? 3b> Is "In Euclidean geometry" essential to definition - or is it there to give context to the article topic? 4>angular "eight" (quotes around 8) -- from a resemblance to a figure "8", right? (not 8 angles) (Also an angular "∞") 5>"A complex rectangle has the same vertex arrangement as a simple rectangle" seems very unhelpful if meant as part of a def, compared to "self-intersecting equiangular quadrilateral". Could it be dropped in favor of the latter?-- JimWae ( talk) 18:50, 22 April 2010 (UTC)
This 2009-AUG-26 edit by Kinewma radically changed the lede. I think this was likely a complete misfire. Just because there is a shape that gets the name "crossed-rectangle" does not mean anyone considers that shape to be a rectangle - and there is no source for the claim that anyone does. Crossed rectangles are the shape of a wire-frame rectangle that has been twisted - they are no longer rectangles, just as one folded in half would no longer be a rectangle. The lede needs to be fixed:
I think we should also say rectangles are 2-dimensional plane figures (quadrilateral article does not seem to say that either - [but perhaps some include skewed quadrilaterals as quadrilaterals?]). We might also reinsert the "ABCD" way of identifying a rectangle-- JimWae ( talk) 19:25, 26 April 2010 (UTC) Btw, I also see usage of "skewed rectangle" - But in what ways it remains a rectangle I do not see.-- JimWae ( talk) 21:26, 26 April 2010 (UTC)
From while article:
While is used in British English also, so this is not just a matter of Eng-var. I see no reason to use terminology that needlessly makes the article seem archaic. Would anyone object if we dispensed with "whilst" in favour of "while"?-- JimWae ( talk) 03:00, 3 May 2010 (UTC)
I planned a new sentence anyway before reading this! I thought I was logged in. 87.114.116.129 was me (not a permanent url), but not for any previous edits/vandalism! Kinewma ( talk) 20:11, 3 May 2010 (UTC)
My understanding of the non-planar (or 3D) skew rectangle is that it is the shape that would be formed by folding a rectangular piece of paper along a diagonal. 2 angles are unchanged. The other 2 are equal, but they are not on the same plane as either of the other 2 & have to be measured in 3 dimensions. The only way I see they could still be right angles is if you fold the paper so the planes are perpendicular - but that is a special case.-- JimWae ( talk) 08:22, 5 May 2010 (UTC)
We need sources to prove or disprove my assumption that a skew rectangle is the result of folding a planar rectangle along a diagonal (I didn't think it could be anything else). If ABCD is a skew quadrilateral, with opposite sides equal and DAB and BCD right angles, then ABC and CDA are acute angles. (All angles are in 2D as any 3 points are coplanar.) Spherical rectangles exist (google 968 hits), but mathematicians do not regard any figure in hyperbolic geometry as a 'rectangle' - see Hyperbolic Geometry. —Preceding unsigned comment added by Kinewma ( talk • contribs) 23:54, 5 May 2010 (UTC) In spherical geometry a spherical rectangle is divided by a diagonal into two similar spherical triangles, but in hyperbolic geometry (according to Mathworld) there are no similar triangles. Kinewma ( talk) 00:22, 6 May 2010 (UTC) My mistake - hyperbolic geometry does have similar triangles, but just as in spherical geometry they are always congruent. Kinewma ( talk) 00:34, 6 May 2010 (UTC)
When mathematicians (not just source I gave) say there are no rectangles in hyperbolic geometry I think they just mean that there are no rectangles with 4 right angles. My skew rectangles are just bent rectangles! Skew rectangles having four equal angles (not right angles) sounds a plausible definition. Are the edges of a skew rectangle straight lines or arcs? If they are straight lines (AB, BC, CD, DA) then they and the rectangle's diagonals (AC and BD) are the edges of a tetrahedron in which AC and BD do not intersect so a saddle rectangle (a skew rectangle whose diagonals intersect) does not exist. Or are the edges straight lines but the diagonals arcs? Kinewma ( talk) 05:56, 7 May 2010 (UTC)
According to Stars: A Second Look by Michael de Villiers, "The interior angle sum of the crossed quadrilateral is 720 degrees. This is usually very surprising to children and adults alike." I wouldn't call a 'crossed rectangle' a degenerate rectangle. It's either a true rectangle (like a crossed quadrilateral is regarded as a quadrilateral) or it isn't a rectangle at all (which is what I've reluctantly edited the article to say). Kinewma ( talk) 04:29, 29 April 2010 (UTC)
A crossed rectangle is a self-intersecting instance of a generalized rectangle defined as any quadrilateral with the same vertices as a rectangle. Kinewma ( talk) 03:35, 30 April 2010 (UTC)
My thought now is that it is a subject better handled under crossed-quadrilateral since there's no dispute in that term, and there a statement can be made of different types, including crossed-rectangle, which alternates pairs of long and short edges like a convex rectangle, but doesn't have right angles. Tom Ruen ( talk) 05:19, 1 May 2010 (UTC)
Definition:
I'm puzzled as to how Michael de Villiers' definition of a rectangle: "Rectangle - any quadrilateral with axes of symmetry through each pair of opposite sides"
[1]can allow his "crossed rectangle" as a candidate. Can anyone explain his thinking?
Dbfirs
07:52, 3 May 2010 (UTC)
Regarding the question of whether the images shown in the Tessellations section of this article are isogonal: The article isogonal figure says: That implies that each vertex is surrounded by the same kinds of face in the same or reverse order, and with the same angles between corresponding faces. With the exception of the third image, it looks to me like that criterion is met. What am I missing? Duoduoduo ( talk) 20:05, 12 April 2011 (UTC)
Perhaps the original list was isogonal and then more were added? The basket weaves" can be seen as 2-isogonal, with two types of vertices, with 3 or 4 edges connecting them. The first, second and last are all isogonal. Tom Ruen ( talk) 20:31, 12 April 2011 (UTC)
1-isogonal | 1-isogonal | 2-isogonal | 2-isogonal | 1-isogonal |
---|---|---|---|---|
![]() Stacked bond |
![]() Running bond |
![]() Basket weave |
![]() Basket weave |
![]() Herringbone pattern |
it is often useful to have shapes similar to rectangles, but with rounded corners.
but what are these called? the often used "rectangle with rounded corners" is self-contradictory, since a rectangle is defined a something with straight sides which intersect at right angles.
JLW30
10:11, 8 January 2007 (UTC)
If you referred to it as a rounded oblong, that may make sense using the definition of an oblong as something longer than it is wide.
My friend from the Phillipines insists that an oblong is exactly that- a rectangle with rounded corners. In Australia we are taught that an oblong is a non-square rectangle. I think in common usage it may be fine to call a rectangle with rounded corners an oblong, but it is too ambiguous for mathematical usage.
A rectangle with rounded corners is called a "rounded rectangle", per this reference site:
http://mathworld.wolfram.com/RoundedRectangle.html — Preceding
unsigned comment added by
192.91.173.36 (
talk)
19:47, 8 January 2015 (UTC)