Acone fits inside a square pyramid as shown. for every cross section, the ratio of the area of the circle to the area of the square is or . since the area of the circle is the area of the square, the volume of the cone equals the volume of the pyramid or or πrh. the volume of the pyramid or or πr2h. the volume of the pyramid or or πr2h. the volume of the pyramid or or πr2h.