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4th grade

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Mr. Kimball has a swimming pool that measures 20 feet long by 15 feet wide. He is adding a walkway around the pool that is 3 feet wide all around. What will be the perimeter of the walkway?

  • 4th grade -

    20 + 6 = 26
    15 + 6 = 21

    P = (2 * 26) + (2 * 21)
    P = ?

  • 4th grade -

    Can it be: (2*20) + (2*15) + (4*3)

  • 4th grade -

    Draw this out on a piece of graph paper. Then you'll see which answer is correct.

  • 4th grade -

    But wouldn't it be (2*23) + (2*18) than?

  • 4th grade -

    The walk goes all the way around the pool.

    The pool is 20 feet long and has 3 feet of walk on one end and 3 feet of walk on the other end. Thus the length of the walk on each side is 26 feet.

    The pool is 15 feet wide and has 3 feet of walk on each side. Thus the total length of the walk on each side is 21 feet.

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