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A 12-ft-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? a. 78 ft. b. 78 ft2. c. 198 ft. d. 198 ft2

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meerkat18
we are given with a swimming pool with dimensions 
12-ft-by-15-ft. given that there is a 3-ft-wide no-slip surface around it, the new dimensions now become (12+3+3) or 18 ft by (15+3+3) or equal to 21 ft. The perimeter is the sum of the sides of the new rectangle. Perimeter is equal to 18+ 18 + 21 + 21 or equal to 78 feet

Answer:

a. 78 ft

Step-by-step explanation:

First calculate the length and width of the rectangle around the swimming pool.

Length: [tex]15+3+3=21ft[/tex]

Width: [tex]12+3+3=18ft[/tex]

The circumference is the sum of 2 times the length and 2 times the width:

[tex]C=(2*l)+(2*w)\\C=(2*21)+(2*18)\\C=42+36\\C=78ft[/tex]