Circumference = π*d = 7π = 21.99 ft
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Circumference of the circle = 7*pi feet
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 7 feet refers to the diameter, multiply that by pi.
pi*diameter = circumference Rearrange the formula so as the diameter is the subject of the formula: diameter = circumference/pi diameter = 7/pi = 2.228169203
7/pi = diameter