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?

78 ft
78ft 2
198 ft
198 ft 2

Answer 1

The pool and the no slip surface around it form a rectangle

with:

length = 15 ft + 3 ft + 3ft = 21 ft

width = 12 ft + 3 ft + 3ft = 18 ft


The perimeter of this rectangle is 21 ft +21 ft +18 ft +18 ft = 78 ft


Answer: 78 ft