Question

The dimensions of a box that is a rectangular prism are 3 inches, 4 inches, and 6 inches. What is the length of the diagonal from the point R to point S, to the nearest tenth of an inch?

a 5 inches

b 6.7 inches

c 7.8 inches

d 61 inches

Rodney chose b as the correct answer. how did he get that answer

Answer 1

Answer: C

Explanation:

We can use the 3D pythagorean theorem.

This gives us sqrt(3^2 + 4^2 + 6^2) = sqrt(61), which is about 7.8

As to how he got B, I don't know.