Radius = 15
Diameter = 2 x radius = 30
Circumference = pi D = 30 pi = 94.25 (rounded)
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15
The radius is 1.27cm
A radius (not raduis) of 15 units implies a circumference of 94 units.
Circumference = 2*pi*rCircumference = 2*pi(15 inches)= 94 inches========
Circumference of a circle = 2*pi*radius or diameter*pi