Go language program to calculate circle circumference

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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

package main

import "fmt"

func main() {

  var circleRadius float64
  var circumferenceOfCircle float64
  fmt.Println("Please enter the radius of circle:")
  fmt.Scanf("%f", &circleRadius)
  circumferenceOfCircle = 2 * 22/7 * circleRadius
  fmt.Println("Circumference of circle is: " , circumferenceOfCircle)


Please enter the radius of circle:
Circumference of circle is:  54
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