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r2*pi=A

π ● r²

or pi times the radius squared

If you are given the diameter just divide that by 2 giving you the radius. After that square the radius (multiply by it by itself). Then multiply that answer by 3.14 or pi.

Area of a circle = pi*radius2

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βˆ™ 11y ago
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Q: What is the formula for the area of the circle?
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