Assuming that "it" refers to diameter, the radius is 7 cm and the circumference is 44.0 cm.
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The radius is: 6.267 cm
Circumference = 2*pi*radius or pi*diameter Circumference = 87.9645943 or 88 cm to the nearest cm
C=2 pi R
If a circle circumference is 30 the radius is: 4.77
The radius of a circle with a circumference of 59 is: 9.39