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The circumference C of a circle with radius R is

C = 2*pi*R

pi = 3.1416...

R = 18

Using a calculator:

C = 113 inches

This is the length of track of an HO model train laid out with eight curved sections to form a circle of radius 18 inches, such as around a Christmas tree.

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Q: What is the circumference of a circle with radius of 18?
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