The formula for finding the surface area of a rectangular prism isA = 2(wl + hl + hw). To find the surface area, all you have to do is insert the values found on your diagram into the formula and solve for A.
A = 2(wl + hl + hw)
A = 2([3][9] + [5][9] + [5][3])
A = 2(27 + 45 + 15)
A = 2(87)
A = 174
The surface area of the figure shown is 174 in².