The radius is 7 inches.
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The radius of a circle whose circumference is 40pi is 20 units.
The circumference of a circle is its diameter times pi, which is the same as twice the radius times pi.A = 2r (pi)In this instance, the circumference is 32(pi) inches(about 100.53 inches)
Circumference = 7*pi which is about 22 inches
circumference = 2*pi*1.4 cm
Five times twice pi.