To find the surface area, you need to find the area of each side of the pyramid.
The first area you can find is the square at the bottom. 16 x 16 = 256
You can then find the area of one of the sides. 15 x 16 = 240. You don’t have to divide this by half even though it’s a triangle because the two triangles make the one side. You multiply 240 x 4 = 960 because there are four sides.
