Question

15 points!!

What is the approximate surface area of this right prism with triangular bases?

A 200 ft. ²
B. 240 ft. ²
C. 394.2 ft. ²
D. 460.8 ft. ²

Answer 1

b

Step-by-step explanation:

9x7.8x1/2x12

Answer 2

C. 394.2 ft²

Step-by-step explanation:

surface area of triangular prism: (a+ b + c) × length + base × height

Here given:

• a = 9 ft

• b = 9 ft

• c = 9 ft

• base = 9 ft

• length = 12 ft

• height = 7.8 ft

Applying the formula:

• (9+ 9 + 9) × 12 + 9 × 7.8

• 394.2 ft²