the answer is 21.
the circomference is 3 times
the diameter. so 7 times 3 = 21
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7/pi = diameter
d = 7 inches (7.00282")
The circumference is about 43.98 inches. The circumference of a circle is diameter (radius x2) x pi (3.14).
Circumference = pi*diameter = 21.99 inches, approx.
pi*diameter = circumference Rearrange the formula so as the diameter is the subject of the formula: diameter = circumference/pi diameter = 7/pi = 2.228169203