Answer:
288 square centimeters
Explanation:
The surface area is the area of all the surfaces of the prism.
There is
Top Triangle
Bottom Triangle
Front Rectangle
Side Rectangle
Another Side Rectangle
Note:
Area of Triangle = 0.5 * base * height
Area of Rectangle = base * height
Lets find each area and add them up.
Top Triangle = 0.5 * 9 * 12 = 54
Bottom Triangle = 0.5 * 9 * 12 = 54
Front Rectangle = 15 * 5 = 75
Right Rectangle = 12 * 5 = 60
Left Rectangle = 9 * 5 = 45
Total Surface Area = 54 + 54 + 75 + 60 + 45 = 288 square centimeters