geometry
posted by Hannah .
The floor of a bedroom is 12 feet by 15 feet and the walls are 7 feet high. One gallon of paint covers 450 square feet. How many gallons of paint do you need to paint the walls of the bedroom?

geometry 
Ms. Sue
How do you think this problem should be solved?
Remember: there are two walls of one size and two walls of another size. 
geometry 
Hannah
12x 12 x15x15

geometry 
Ms. Sue
No. Picture each wall as a rectangle. Find the area of each wall.
What about the height of the walls? 
geometry 
Hannah
12 x 15 x 7 =450
would it be 2.8 galloons 
geometry 
Ms. Sue
Let's start over.
Two walls are 12 feet by 7 feet.
A = 2(12 * 7) = 168 square feet
Two walls are 15 feet by 7 feet.
A = 2 (15 * 7) = 210 square feet
210 + 168 = 378 square feet of walls
It sounds like just one gallon of paint will cover the four walls.
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