In the quantitative morphology of some the fruit plants of the Rosaceae family ( Apple, pear, quince, etc.), 2 formulas of Sardaryan L. S. are approximately performed for the area (S) of a simple oval (elliptic) leaf and for the area of the axial cross-section (Ssect) of a simple fruit of the Apple type{ ^{[1] [2] [3] [4]}

${\displaystyle S=\pi {\frac {(l+2d)^{2}}{36}}}$

${\displaystyle Ssect={\frac {\pi (5l+3.5d)^{2}}{288}}}$

where ${\displaystyle l}$ is the sheet length (height) of the fetus, ${\displaystyle d}$ - the width of the sheet (of the fetus), ${\displaystyle \pi =3,14....}$