how much glass is there on the sides of the building?

Question

A building is a rectangular prism with a base of 20 x 40 feet and a height of 90 feet. the window washer charges according to the total area of the glass on the sides of the building. Assuming all 4 sides are covered in glass, how much glass is there on the sides of the building?

Answer 1

Mariah, how do we find area? Length x width, right?

 

Let's think about it. The building has 4 sides. Two of the sides are 20 ft x 90 ft and the other two are 40 ft x 90 ft. 

 

I bet you can get it from here!