Sally wants to build a fence around her pool. The pool is 26 feet long by 21 feet wide. The fence is to be 15 feet from the edge of the pool.

What are the outside dimensions of the area surrounding the pool?

How many feet of fencing will Sally need?

To find the dimensions of the fencing, you will need to consider that the fence will be 15 feet away on all sides of the pool.

This means the 26 feet length of the pool would have 15 feet added on both sides making the fence length 56 feet.

The 21 feet width would also have 30 feet added to it making the fence width 51 feet.

The fence dimensions would be 51 by 56, so the amount of fencing needed (the perimeter) is

51 x 2 + 56 x 2

102 feet + 112 feet

214 feet of fencing is needed.