Question

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?
(1 point)
Responses

78 ft

78 ft2

198 ft

198 ft2

Answer 1

To find the outer perimeter of the no-slip surface, we need to add the lengths of all four sides.

The length of the pool is 12 ft and the width is 15 ft.

Since there is a 3-ft-wide no-slip surface around the pool, we need to add 3 ft to each side.

So, the length of the no-slip surface is 12 + 3 + 3 = 18 ft.

And the width of the no-slip surface is 15 + 3 + 3 = 21 ft.

Therefore, the outer perimeter of the no-slip surface is 2(18 + 21) = 2(39) = <<2*(18+21)=78>>78 ft.

So, the correct answer is 78 ft.