Question

What is the surface area of this triangular prism rounded to the nearest tenth?

A) 63.3 cm2

B) 75.6 cm2

C) 85.7 cm2

D) 97.2 cm2

Answer 1

The answer is C.
SA = bh + (s1 + s2 + s3)H
SA = (6.8)(5.1) + (6.8 + 5.1 + 8.5)(2.5) = 85.68

Answer 2

The correct option is C.

`\text{The surface area is=}85.7cm^2`

Explanation:

Given the right triangular prism.

we have to find the surface area of given right triangular prism.

As triangular prism is formed with two right triangles and 3 rectangles with different length and breadth.

∴
`\text{Surface area =}2((1)/(2))base* height + (s_1 + s_2 + s_3)H`

`=(6.8)(5.1)+(6.8+ 5.1+8.5)(2.5)`

`=85.68\sim85.7cm^2`

Hence, correct option is C.