Asked by Anonymous
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
78 ft^2
198 ft
198 ft^2
I've already completed it, and know the answer is 78 ft, but I don't quite understand it. I would appreciate if someone could explain the problem. I thought it would have been +3 to each side, so 12 ft becomes 15 ft, and the other side, which is 15 ft, will be 18 ft. This is incorrect though, so I'm confused.
Thank you!
78 ft
78 ft^2
198 ft
198 ft^2
I've already completed it, and know the answer is 78 ft, but I don't quite understand it. I would appreciate if someone could explain the problem. I thought it would have been +3 to each side, so 12 ft becomes 15 ft, and the other side, which is 15 ft, will be 18 ft. This is incorrect though, so I'm confused.
Thank you!