The
total surface area of a regular pyramid
is the sum of the areas of its lateral faces and its base.
The area of the faces = four times the area of the triangle = 4 * ( 0.5 * height * base ) = 4 * ( 0.5 * 8 * 15 ) = 240 The area of the base = area of a square = 8 * 8 = 64