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9
pi is not divided into anything - unless you specify pi/2 or pi/3.6
About 9. 254.5 divided by 3.14 = 81.0509554. Square root it is about 9.
The circumference of any circle divided by its diameter is equal to pi
9. Circumference equals 2 times Pi times the radius. C=2(pi)r. "r" for radius. So if your circumference is 18 times pi, then you do 18 divided by 2, which gives you a radius of 9.