Question

25+ Points for BEST TWO answers!

1. What is the surface area of the right trapezoidal prism?

[SEE ATTACHMENT]

A. 130 cm²

B. 114.5 cm²

C. 48.5 cm²

D. 98.5 cm²


2. The four walls of a room are going to be wallpapered. The room is shaped like a rectangular prism, and its length, width, and height are 20 ft, 18 ft, and 9 ft, respectively.

How much wallpaper is needed to complete the job?
[SEE SECOND ATTACHMENT]

A. 684 ft²

B. 342 ft²

C. 1080 ft²

D. 796 ft²

Answer 1

You are not supposed to be wallpapering the ceiling or the floor. Because of that the formula to answering this question is: 2(h*w) + 2(l*w) [to account for the 4 walls being wallpapered]
2(9 x 18) + 2(9 x 20)
2(162) + 2(180)
324 + 360
684 is the answer