Circle Circumference, Circle Area, Sphere Area, Sphere Volume, Cylinder Area, Cylinder Volume

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Circle Formulas

Circumference = 2 • π • radius = π • diameter

Circle Area = π • r² = ¼ • π • d²

*************************** Sphere Formulas

Sphere Surface Area = 4 • π • r² = π • d²

Sphere Volume = 4/3 • π • r³ = ( π •d³)/6

Click here or here for partially-filled sphere calculators.

*************************** Cylinder Formulas

Surface Area = (2 • π • r²) + (2 • π • r • height) Where (2 • π • r²) is the surface area of the "ends" and
(2 • π • r • height) is the lateral area (the area of the "side").

Volume = π • r² • height = ¼ • π • d² • height

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