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How Do You Find the Circumference of a Circle if You Know the Radius?
The radius of the following circle is 3 in. Find the circumference of the circle. Use 3.14 for π .
Summary
- C stands for circumference,
π stands for pi, and d stands for diameter - r is a variable standing for radius
- The "3 in" line in the diagram is the radius of the circle, so let's use the formula on the right
π is an irrational number, but we're approximating it as 3.14
Notes
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- We'll use the formula that involves radius because that's a value we know
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