Homework 8-5: Surface area of Pyramids & Cones

Find the surface area.

A roof in the shape of a cone has a diameter of 15 feet and a slant height of 18 feet. If one box of shingles covers 34 square feet and costs $27, how much will it cost to cover the roof in shingles?

The solid, shown at left, shows two square pyramids. If the top pyramid has a slant height of 15 feet, the bottom pyramid has a slant height of 10 feet, and the base edge is 8 feet, find the surface area of the solid.

*Hint: The base is NOT included.