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Sardaryan's formulas
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{{{sfn|Sardaryan L. S. (in Russian) Opredelenie ploshchadi list'evyabloni [Definition of  the leaf area of the apple tree ],Izvestiya selskohozyaystvennyh nauk Armyanskoy SSR, 1984, no.5, pp. 51-54.}}{{sfn|Sardaryan L.S. (in Russian) Matematicheskie printsipy postroeniya list'ev i  plodov yabloni./ L.S.Sardaryan, G. L.Sardaryan// Biologicheskie osnovy sadovodstva i ovoshchevodstva  [Mathematical  principles  of  the  leaves  and fruits composition  of  the  apple  tree./ L.S. Sardaryan  G. L. Sardaryan// Biological basis of Horticulture], Michurinsk, 2010, pp. 298-303.}}


 * $$ S=\pi {\frac {(l+2d)^{2}}{36}} $$
 * $$ Ssect={\frac {\pi (5l+3.5 d)^{2}}{288}} $$

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