If you are asking about a 27' circumference pool, then the answer is 27'
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Well, honey, a 14-foot round circle has an area of about 154 square feet. Just take the radius (half the diameter) which is 7 feet, square it, and multiply by pi. Voila, you've got your answer. Math can be a piece of cake when you just dive in and get it done!
8,712,000 Square Feet
It depends upon how cold it is outside. However, my computer consumes roughly 500 Watts and can adequately heat my 960 cubic foot room when the temperature outside is around freezing outside. Your 1500 Watts of heating power should be just as effective at heating 3 times the volume, or 2,880 cubic feet. Presuming that your room is 8 feet tall, this means that it should be able to heat a room up to 360 square feet large.
fifty-six The circumference of an 18-foot circular swimming pool is: 56.55 feet
For a circle of 20 feet diameter, its perimeter equals Pai x diam = 3.14 x 20 feet equals 62.80 feet around 63 feet.