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How to Calculate the Circumference of a Circle: Easy Guide

Learn the simple formulas to calculate the circumference of any circle effectively and easily.

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Video transcript

To calculate the circumference of a circle, use the formula: C = 2πr, where C is the circumference and r is the circle's radius. Alternatively, if you know the diameter d, use C = πd.

Questions and answers

  1. What is the formula for the circumference of a circle?

    The formula for the circumference of a circle is C = 2πr, or alternatively C = πd if you know the diameter.

  2. How do I find the radius if I only have the diameter?

    To find the radius when you have the diameter, simply divide the diameter by 2.

  3. What does π represent in the circle circumference formula?

    In the circumference formula, π (pi) is a mathematical constant approximately equal to 3.14159.

  4. Can I calculate circumference without knowing the radius or diameter?

    No, you need either the radius or diameter to calculate the circumference of a circle.

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