How do you calculate the square area of a pentagon?

Answer by  Gael (5)

For every polygon A = 0.5 * P * a (where A= area, P = perimeter, a = apothem) For a regular pentagon with side length x this is: A = 0.5 * 5x * 0.5*x*tan(54 deg) Which results in 1.25 * x^2 * tan(54 deg), which is approximately 1,72 * x^2.

Answer by  brownie17 (170)

one way is to divide the pentagon into triangles find the area of each triangle and add them up. this is how to find the square os a pentagon