Circumference calculatorThe following circumference calculator is easy to use. Just enter the value of the radius and hit calculate button. Recall that the formula to get the circumference of a circle is 2 ×pi×r with r = 3.141592653589793 Therefore, the circumference depends only on the size of r. That is why you only need to enter r here to get the circumference The calculator will only accept positive value for r since a distance cannot be negative As a reminder, if r = 4 cm for instance, circumference = 2 ×3.14 ×4 = 25.12 cm Fun math game: Destroy numbered balls by adding to 10






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