if the circumference is 31 inches you know that...
Diameter = circumference/(pi)
D = 31in/3.1
D=10
r= 1/2D
r=1/2(10)
r=5
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radius of 31 inches
The radius of a circle with a 14.5 inch circumference is 2.15 inches
The circumference of a circle with a radius of 31 meters is about 194.8 meters.
1 inch
The radius of a circle is half the diameter, so the radius of a 6 inch diameter circle is 3 in.