Article: Parallel Postulate
Questions for evaluation:
Possible Topics: Spieker circles or Epispirals
I will be working from the stub articles already on Wikipedia to extend the scope of one of these articles.
The topic I have chosen to expand upon is Spieker circles due to the accessibility of resources for this related information as opposed to epispiral information.
References:
The Eperson-Spieker Circle- Bellew https://www.jstor.org/stable/3619628?read-now=1&loggedin=true&seq=1#page_scan_tab_contents
A generalisation of the Spieker circle and Nagel line- De Villiers
A treatise on the circle and the sphere- Coolidge
Episodes in Nineteenth and Twentieth Century Euclidean Geometry, Volume 37- Honsberger
I will add the following content and citation to the Spieker circle stub article:
Spieker circles also have relations to Nagel points. The incenter of the Speiker circle and the Nagel point form a line within the Spieker circle. The middle of this line is the exact center of the Spieker circle. [1]
Maintain the current lead section from the stub article and the accompanying image
The Spieker circle and Spieker center are named after Theodor Spieker, a mathematician and professor from Potsdam, Germany. [2] In 1862, he published Lehrbuch der ebenen geometrie mit übungsaufgaben für höhere lehranstalten, dealing with planar geometry. [2] Due to this publication, influential in the lives of many famous scientists and mathematicians including Albert Einstein, Spieker became the mathematician for whom the Spieker circle and center were named. [1]
To find the Spieker circle of a triangle, the medial triangle must first be constructed from the midpoints of each side of the original triangle. [1] The circle is then constructed in such a way that each side of the medial triangle is tangent to the circle within the medial triangle, creating the incircle. [1] This circle center is named the Spieker center.
Spieker circles also have relations to Nagel points. The incenter of the triangle and the Nagel point form a line within the Spieker circle. The middle of this line segment is the Spieker center. [1] The Nagel line is formed by the incenter of the triangle, the Nagel point, and the centroid of the triangle. [1] The Spieker center will always lie on this line. [1]
Spieker circles were first found to by very similar to nine-point circles by Julian Coolidge. At this time, it was not yet identified as the Spieker circle, but is referred to as the "P circle" throughout the book. [3] The nine-point circle with the Euler line and the Spieker circle with the Nagel line are analogous to each other, but are not duals, only having dual-like similarities. [1] One similarity between the nine-point circle and the Spieker circle deals with their construction. The nine-point circle is the circumscribed circle of the medial triangle, while the Spieker circle is the inscribed circle of the medial triangle. [3] With relation to their associated lines, the incenter for the Nagel line relates to the circumcenter for the Euler line. [1] Another analogous point is the Nagel point and the othocenter, with the Nagel point associated with the Spieker circle and the orthocenter associated with the nine-point circle. [1] Each circle meets the sides of the medial triangle where the lines from the orthocenter, or the Nagel point, to the vertices of the original triangle meet the sides of the medial triangle. [3]
The nine-point circle with the Euler line was generalized into the nine-point conic. [1] Through a similar process, due to the analogous properties of the two circles, the Spieker circle was also able to be generalized into the Spieker conic. [1] The Spieker conic is still found within the medial triangle and touches each side of the medial triangle, however it does not meet those sides of the triangle at the same points. If lines are constructed from each vertex of the medial triangle to the Nagel point, then the midpoint of each of those lines can be found. [4] Also, the midpoints of each side of the medial triangle are found and connected to the midpoint of the opposite line through the Nagel point. [4] Each of these lines share a common midpoint, S. [4] With each of these lines reflected through S, the result is 6 points within the medial triangle. Draw a conic through any 5 of these reflected points and the conic will touch the final point. [1] This was proven by de Villiers in 2006. [1]
The Spieker radical circle is the circle, centered at the Spieker center, which is orthogonal to the three excircles of the medial triangle. [5] [6]
![]() | This is a user sandbox of
RALmath. You can use it for testing or practicing edits. This is not the sandbox where you should draft your assigned article for a dashboard.wikiedu.org course. To find the right sandbox for your assignment, visit your Dashboard course page and follow the Sandbox Draft link for your assigned article in the My Articles section. |
Article: Parallel Postulate
Questions for evaluation:
Possible Topics: Spieker circles or Epispirals
I will be working from the stub articles already on Wikipedia to extend the scope of one of these articles.
The topic I have chosen to expand upon is Spieker circles due to the accessibility of resources for this related information as opposed to epispiral information.
References:
The Eperson-Spieker Circle- Bellew https://www.jstor.org/stable/3619628?read-now=1&loggedin=true&seq=1#page_scan_tab_contents
A generalisation of the Spieker circle and Nagel line- De Villiers
A treatise on the circle and the sphere- Coolidge
Episodes in Nineteenth and Twentieth Century Euclidean Geometry, Volume 37- Honsberger
I will add the following content and citation to the Spieker circle stub article:
Spieker circles also have relations to Nagel points. The incenter of the Speiker circle and the Nagel point form a line within the Spieker circle. The middle of this line is the exact center of the Spieker circle. [1]
Maintain the current lead section from the stub article and the accompanying image
The Spieker circle and Spieker center are named after Theodor Spieker, a mathematician and professor from Potsdam, Germany. [2] In 1862, he published Lehrbuch der ebenen geometrie mit übungsaufgaben für höhere lehranstalten, dealing with planar geometry. [2] Due to this publication, influential in the lives of many famous scientists and mathematicians including Albert Einstein, Spieker became the mathematician for whom the Spieker circle and center were named. [1]
To find the Spieker circle of a triangle, the medial triangle must first be constructed from the midpoints of each side of the original triangle. [1] The circle is then constructed in such a way that each side of the medial triangle is tangent to the circle within the medial triangle, creating the incircle. [1] This circle center is named the Spieker center.
Spieker circles also have relations to Nagel points. The incenter of the triangle and the Nagel point form a line within the Spieker circle. The middle of this line segment is the Spieker center. [1] The Nagel line is formed by the incenter of the triangle, the Nagel point, and the centroid of the triangle. [1] The Spieker center will always lie on this line. [1]
Spieker circles were first found to by very similar to nine-point circles by Julian Coolidge. At this time, it was not yet identified as the Spieker circle, but is referred to as the "P circle" throughout the book. [3] The nine-point circle with the Euler line and the Spieker circle with the Nagel line are analogous to each other, but are not duals, only having dual-like similarities. [1] One similarity between the nine-point circle and the Spieker circle deals with their construction. The nine-point circle is the circumscribed circle of the medial triangle, while the Spieker circle is the inscribed circle of the medial triangle. [3] With relation to their associated lines, the incenter for the Nagel line relates to the circumcenter for the Euler line. [1] Another analogous point is the Nagel point and the othocenter, with the Nagel point associated with the Spieker circle and the orthocenter associated with the nine-point circle. [1] Each circle meets the sides of the medial triangle where the lines from the orthocenter, or the Nagel point, to the vertices of the original triangle meet the sides of the medial triangle. [3]
The nine-point circle with the Euler line was generalized into the nine-point conic. [1] Through a similar process, due to the analogous properties of the two circles, the Spieker circle was also able to be generalized into the Spieker conic. [1] The Spieker conic is still found within the medial triangle and touches each side of the medial triangle, however it does not meet those sides of the triangle at the same points. If lines are constructed from each vertex of the medial triangle to the Nagel point, then the midpoint of each of those lines can be found. [4] Also, the midpoints of each side of the medial triangle are found and connected to the midpoint of the opposite line through the Nagel point. [4] Each of these lines share a common midpoint, S. [4] With each of these lines reflected through S, the result is 6 points within the medial triangle. Draw a conic through any 5 of these reflected points and the conic will touch the final point. [1] This was proven by de Villiers in 2006. [1]
The Spieker radical circle is the circle, centered at the Spieker center, which is orthogonal to the three excircles of the medial triangle. [5] [6]
![]() | This is a user sandbox of
RALmath. You can use it for testing or practicing edits. This is not the sandbox where you should draft your assigned article for a dashboard.wikiedu.org course. To find the right sandbox for your assignment, visit your Dashboard course page and follow the Sandbox Draft link for your assigned article in the My Articles section. |