Question

A=pir^2 solve for pi

Answer 1

Given problem;

   A = $\pi$ r²

   Solve for π;

To solve for π implies that we make it the subject of the expression.

So;

       A = π r²

      Now multiply both sides by $\frac{1}{r^{2} }$

 So;

                A x $\frac{1}{r^{2} }$   = $\pi$ x r² x $\frac{1}{r^{2} }$

              r² cancels out from the right side and leaves only π;

                  π = $\frac{A}{r^{2} }$

So    $\pi = \frac{A}{r^{2} }$