If you meant that is 7 in circumference, then divide by pi.
7/3.1416 = 2 Answer is rounded to one significant figure.
If you meant 7 in radius, then multiply by 2 to get diameter
7 X 2 = 14.
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There are about 38.48 square feet in a 7' diameter circle
7/pi = diameter
The diameter of a circle is twice the radius. When the diameter is 7 metres, the radius is 3.5 metres.
The area of a circle with a 7-foot diameter is: 38.48 square feet.
pi*diameter = circumference Rearrange the formula so as the diameter is the subject of the formula: diameter = circumference/pi diameter = 7/pi = 2.228169203