CIRCLE:
perimeter = 2 * pi * r
area = pi * r^2
CYLINDER:
volume = pi * r^2 * h (area of circle-part * height of cylinder)
could also use pi * d^2 * h / 4 (as said earlier)
area = 2 * pi * r^2 (circular ends) + 2 * pi * r * h (tube part)
or it could be written as: 2 * pi * (r^2 + (r * h))
SPHERE:
area = 4 * pi * r^2
volume = (4 * pi *r^3) /3
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