try to rearrange the equation a = (pi)r^2 for R?

Answer 1

Sure!

a = πr^2

To solve for R, we first isolate the term containing R:

a = πr^2
a = πr * r
a = π * r * r
a = π * (r * r)

Now we can divide both sides by π to solve for R:

a/π = r * r
(a/π)^(1/2) = r

Therefore, the equation rearranges to:

R = √(a/π)