Divide the diameter by two to get the radius. Then you can use the standard formula for the area of a circle, which I copy here for your convenience:
area = pi x radius squared
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fifty-six The circumference of an 18-foot diameter circular swimming pool is: 56.55 feet
Circumference = pi X diameter so.......... diameter = circumference/pi 50 feet/pi = 15.92 feet call it 16 feet
You need 1962.5 fence posts.
It has 7 sides but they are not flat, they are slightly curved. The coin is designed to have a constant diameter so that vending machines work with it.
fifty add fifty equal what