Math CentralQuandaries & Queries


Question from Celeste, a parent:

I have a 27ft. above ground pool. I want to put edging around it but do not know how many feet of edging I need. Can You help? The edging will be approximately 2 feet away from the pool.

Hi Celeste,

The circumference of a circle is π times the diameter. I am assuming that 27 feet is the diameter of the pool but your edging is 2 feet away from the pool on both sides so the diameter of the circle of edging is 31 feet. Thus the circumference is

π × 31 = 3.1416 × 31 = 97.39 feet.

I hope this helps,

About Math Central


Math Central is supported by the University of Regina and The Pacific Institute for the Mathematical Sciences.
Quandaries & Queries page Home page University of Regina PIMS