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Area of a circle = pi*r2

Circumference of a circle = 2*pi*r or pi*d

Volume of a sphere = 4/3*pi*r3

Surface area of a sphere = 4*pi*r2

Volume of a cone = 1/3*pi*r2*height

Volume of a cylinder = pi*r2*height

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Q: What are some formulas that include pi?
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