# geometry

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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 -

How do you think this problem should be solved?

Remember: there are two walls of one size and two walls of another size.

• geometry -

12x 12 x15x15

• geometry -

No. Picture each wall as a rectangle. Find the area of each wall.

What about the height of the walls?

• geometry -

12 x 15 x 7 =450
would it be 2.8 galloons

• geometry -

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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