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You can use the circumference of the pencil and the circumference formula to find the radius. Set the measured circumference equal to 2pi*radius and solve. I measured it to about .75 of an inch, so: .75=2pi*radius r=.75/2pi
Circumference = 2*pi*r Circumference = 2 *pi*12 mm 75 mm =====
23.87 inches.
75cm = 29.53"
11.93662073 inches