Circumference equals pi (which is about 3.14) times diameter (or pi times 2 times the radius, which is the same thing). Pi times 4' = 12' 6.8"
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Circumference = Pi x diameter Therefore Circumference = Pi (3.1416) multiplied by 3 feet: Circumference = 9.425 feet, to 3 decimal places. (There is no need to quote Pi to more than four decimal places, then you can remember it)
Diameter of circle: 12/pi = 3.8197 meters to four decimal places
84.82 feet
The circumference is pi times the diameter, so the exact figure is 8 x pi (about 3.1416).To four decimal places, 8 x pi = 25.1327 feet
Circumference = 24*pi = 75.398 inches to 3 dp