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Following program shows you how to calculate circle circumference.
In this program we get circle radius from user and calculate circumference using following formula
Circumference = 2 X PI X r

 puts "Please enter the radius of circle:"
 circleRadius = gets.to_f
 circumferenceOfCircle = 2 * 22/7* circleRadius
 puts "Circumference of circle is:#{circumferenceOfCircle}"

Output:

Please enter the radius of circle:
 4
Circumference of circle is:24.0



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