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because for a 3d shape you use surface area which is the same except you calculate the area of each side and then add them together
a flat PLAIN is a flat area of land
If the radius of the circle is R, and the length of the flat region is c, then the area of the circle containing a flat is: A = R2 [Pi - Arcsin(c / 2R)] + [(c / 2) (R2 - (c / 2)2)1/2] After some calculus and algebra
No. A side normally means a flat surface and a sphere does not have one. It does have one curved surface.
Its a circle.