Question

You are making a pyramid-shaped trophy.

The trophy has a square base with side lengths of 9 inches and a slant height of 11 inches.
The paint needed costs $0.15 per square inch.
How much will it cost to paint the faces of the trophy?

Show your work

Answer 1

Answer:
`\$29.7`

Explanation:

Given

The trophy has a side of
`a=9\ in.`

Slant height
`l=11\ in.`

Rate of painting
`r=\$\ 0.15/in.^2`

Lateral surface area of square pyramid is
`2al`

Insert the values

`\Rightarrow 2* 9* 11\\\Rightarrow 198\ in.^2`

Cost of painting

`\Rightarrow 198* 0.15=\$29.7`