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16 July, 23:31

A 12-by-15 ft rectangular swimming pool has a 3-ft-wide no-slip surface around it. What is the outer perimeter of the no-slip surface?

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  1. 17 July, 02:36
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    1. Find the perimeter of the pool with the non-slip surface:

    The swimming pool has a perimeter of 54 feet with the non-slip surface, found by the formula for the perimeter of a rectangle: 2l+2w=P

    2. Find the perimeter of the pool without the non-slip surface:

    To find the perimeter of the pool without the non-slip surface, subtract three feet from the length and the width, because the non-slip surface adds three feet to the width and the height. Then, use the new width and height (9 feet and 12 feet) to substitute into the perimeter formula.

    2 (9) + 2 (12) = 42

    3. Subtract the pool's perimeter without the non-slip surface from the pool's perimeter with the non-slip surface.

    54 - 42 = 12

    Twelve is the perimeter of the no-slip surface.
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