surface area is the area of all the surfaces
we got 3 rectangles and 2 triangles
rectnagle=length times width
triangle=1/2 times base times height
ok left rectangle is 17 by 10, so 170 square metesr, same as other side rectangle
bottom rectangle is 16 by 10 or 160 square meters
triangles are 16 by 15, so 1/2 times 15 times 16=120, 2 of them so 240 total
170+170+160+240=740 square meters
