A rugby ball is, mathematically speaking, a "prolate spheroid"spheroid-1By the way, the mathematical name of the shape of a coffee grain is "Remb's surface"http://mathworld.wolfram.com/RembsSurface.html
The soccer ball is round in three dimensions. It's a sphere. (The Laws of the Game actually specify a spherical ball.)
The shape of a tin can is a cylinder.
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