What is the radius of a 40 inch circle?

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Answer 1 · 2015-09-25T03:25:49

Approximately 6.37 inches

The circumference of a circle is #2pi * r#

Therefore for a circle of circumference 40 inches and radius r inches

#2pi * r# = 40

r = #40/(2pi)#

r = #20/pi#

#pi# = approx. 3.14159

Therefore r = approx. #20/3.14159# = 6.37 inches