Question:

A/2(pie)=r^2+rh ?i need help on calculus?

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can someone help me find r?

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  1. this equation is the form of

    ax^2+bx+c=0

    where

    x=(-b+-root(b^2-4ac))/2

    r^2+rh-A/2(pie)=0

    so

    r=(-h+-root(h^2+2A/pie))/2

    regards/junho lee

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