Slant surface is composed of 4 triangles each of 8' base B and height H of 12'.
Area of each triangle is therefore
A=(1/2)BH
=(1/2)(8)(12)
=48 sq. ft
Total slant surface area = 4A = 192 sq. ft.
Area of square base = 8*8 = 64 sq. ft
Total surface area = 192+64 = 256 sq. ft.
