How To Compute Perimeter Of A Circle?

Identify the given value: radius (r) or diameter (d)

If radius is given, compute perimeter (circumference) using: C = 2πr

If diameter is given, compute perimeter (circumference) using: C = πd

Use π ≈ 3.14159 (or your calculator’s π)

Substitute the known value and calculate C

Report the result with the correct units