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What are the formulas for the area & circumference of a circle & pi value?

April 26, 2017area Circle circumference formulas Pi value

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What are the formulas for the area & circumference of a circle & pi value?

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Area of a circle (size of interior of circle) pi x radius squared Circumference of a circle (length of circle) 2 x pi x radius Pi value (can be carried out to infinite places) 3.14 ( or 3.14159+) (pi is the ratio of the circumference of a circle to its diameter; and diameter = 2 x radius)