The flat surface area of leaves are just because leaves have a function to perforn i.e. photosynthesis and the flat area increases the availability of sunlight which is a mandatory reuirement for the process.
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A plane is a flat, closed figure.a flat surface on which a straight line joining any two points on it would wholly lie:
It does not have a flat surface.
A plane is a flat surface with no thickness
because it have sex with the ovary and sperm cell gets in.
A flat surface generally refers to a horizontal surface and is referred to as the plane.