Use the image to answer the question.

a triangular prism's measurements are 12 cm, 13 cm, 9 cm, and 5 cm
A wedge of cheese is shaped like a triangular prism. How much plastic wrap is needed to cover the wedge of cheese?
A. 330 cm squared
B. 287 cm squared
C. 810 cm squared
D. 240 cm squared

1 answer

The formula to find the surface area of a triangular prism is:
SA = (perimeter of base x height) + (base area x 2)

First, find the perimeter of the base of the triangular prism:
Perimeter = 12 + 13 + 9
Perimeter = 34 cm

Now, find the base area:
Base area = (1/2) x 9 x 5
Base area = 22.5 cm squared

Next, find the total surface area:
SA = (34 x 5) + (22.5 x 2)
SA = 170 + 45
SA = 215 cm squared

Therefore, you would need 215 cm squared of plastic wrap to cover the wedge of cheese.
So, the closest option is B. 287 cm squared.
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