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22 August, 08:10

The area of a circle is πr2. To find the area of a sector with a central angle of Θ, measured in radians, by what should you multiply πr2?

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  1. 22 August, 08:23
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    There are 2pi radians in a circle

    so the fraciton is Θ / (2pi)

    so

    pir^2 times Θ / (2pi) = pir^2Θ/2pi=Θr^2/2

    multiply it by Θ / (2pi)
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