A12-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?

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.

the answer is b: 18

step-by-step explanation:

use the pythagorean theorem to .

a^2+b^2=c^2

plug 18 for "r"

the 2 legs are 18 and 24

18^2+24^2=c^2

324+576=c^2

900=c^2

c=30

30-12=18

18 is the radius

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