Answer:
684 in²
Explanation:
The surface area of a prism is found using the following formula: SA = 2(lh+lb+bh). This formula takes the area of each face (6 in total( and adds them together to find a total sum. Substitute l = 15, b = 6 and h = 12 to solve for the surface area.
SA = 2(lh+lb+bh)
SA = 2(15*12+15*6+6*12)
SA = 2(180 + 90 + 72)
SA = 2(342)
SA = 684