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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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