Divide the circumference by 2pi
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The radius (not raduis) is 1.25 cm.
The circumference of a circle: 2*pi*radius or pi*diameter
the diameter of a circle is from one side of the circle to the other, and the raduis is always half, because the raduis is from the side to the middle, so the answer is 18
A radius (not raduis) of 15 units implies a circumference of 94 units.
Circumference = 2*pi*radius (not raduis) = 19 cm, approx.