Circle Formulas

Circumference = 2 radius =

diameter Circle Area = r = d

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Sphere Formulas

Sphere Surface Area = 4 r = d

Sphere Volume = 4/3 r = ( d)/6

Click here or here for partially-filled sphere calculators.

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Cylinder Formulas

Surface Area = (2 r) + (2 r height)

Where (2 r) is the surface area of the "ends" and (2 r height) is the lateral area (the area of the "side").

Volume = r height = d height