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Circumference of a circle from the radius

The math skill explains how to calculate the circumference of a circle using the formula \(2 \pi \times \text{radius}\). It also demonstrates converting the result from terms of \(\pi\) to a decimal approximation using \(\pi \approx 3.14\).

Learn circumference of a circle from the radius

Teaching Transcript

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Let's find the circumference, or perimeter, of a circle with a radius of 2

The circumference is 2 times Pi times the radius

The radius is 2, so our circumference is 4 Pi

If we need that as a decimal, Pi is approximately 3.14, so our circumference would be approximately 12.56

Skill Practice

Circumference of a circle from the radius

Test your understanding of circumference of a circle from the radius by practicing it! Work through the below exercises to use it in practice.