The perimeter of the base of the regular quadrilateral pyramid is P = 30 cm. Find the sum of all edges of this pyramid, if the perimeter of a lateral face is 27.5 cm
each face has a base of 30/4 = 7.5
So, there are 4 edges of (27.5-7.5)/2 = 10
So, there are 4 edges of (27.5-7.5)/2 = 10