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Diameter = 10/pi = 3.183098862 feet
The circumference is easy to calculate: diameter x Pi (about 3.1416) = circumference. So,10 feet x 3.1416 = 31.416 feet circumference.
There is a problem here. A circle with a 7-foot diameter has a circumference of 21.99 feet, not 10 feet.If the circumference is 10 feet, that would make the diameter 3.183 feet.
If the circumference of a circle is 10 feet the radius is: about 1.592 feet. For this type of calculation, divide the circumference by Pi (about 3.1416). This gives you the diameter. Next, divide the diameter by two to get the radius.
If the circumference of a circle is 20 feet the diameter is: 6.366 feet (circumference divided by pi = diameter).