how do i solve this R= 1/2 √(A/π) solve for A.

I am helping my son with his homework and this is so confusing can I get some help please
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r=(1/2)root(a/pi) . . . 2r =root(a/pi) . . . 4r^2=(a/pi) . . . a=4*pi*r^2 . . . me thot that spozed tu be 2pi r^2
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