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Why is Pi r*2 derived?

My geometry teacher gave me this question and i didn't know anything about it.

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  • 1 decade ago
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    this means the area of a circle this is what you can use to find it r is the radius pi stand for 3.14 or 22 over 7

    3.14 x radius squared is equal to area of circle

    r*2 means rxr

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  • Anonymous
    1 decade ago

    It is the equation for working out the area of a circle.

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