7*pie=21.99114
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the answer is 21. the circomference is 3 times the diameter. so 7 times 3 = 21
There are about 38.48 square feet in a 7' diameter circle
The area of a circle with a 7-foot diameter is: 38.48 square feet.
Circumference of the circle = 7*pi feet
Presuming that 7 feet is the circle's diameter and that pi is 3.14: Then: 3.14*3.52 = 38.465 square feet