We need to find the triangular pyramid formula which is 1/3*B*H The base is always the bottom or foundation. To find this we need the area of the triangle at the bottom. It is 8*6/2 or base times height divided by 2 We would get 24 This is our B value. Now height is 4 in they give us this. Plug it in 24*4/3 We get 32 inches