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Important Formula:-

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Circumference - Length of the boundary of a circle

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Diameter- Straight line that passes through the midpoint of the circle

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Radius - starts from the midpoint of the circle and touches the wall of the circle.

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Formula:-

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Circumference - πd (value of π (pi) is 22/7 or 3.14)

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OR

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2πr

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Diameter (d) - 2r

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Radius (r) - d/2

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