How do you determine perimeter if given the area?

Answer 1

To find area given perimeter, rename perimeter to circumference and solve with these formulas:

Circumference = 2πr (or 2 * π * r)

Area = πr^2 (or π * r * r)

With these the area can be found from circumference(or perimeter) as follows:

A = π(C / 2π)^2

Now, to find the perimeter given the area;

We use A = πr^2 and rearrange then solve:

r = √(A / π)

So, the circumference would be 2πr = 2π√(A / π)