cube = a 3 
rectangular prism = a b c 
irregular prism = b h 
cylinder = b h = pi r 2 h 
pyramid = (1/3) b h 
cone = (1/3) b h = 1/3 pi r 2 h 
sphere = (4/3) pi r 3 
ellipsoid = (4/3) pi r1 r2
r3 
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