The diameter is 7 cm. Remember that the radius is half the length of the diameter, so let's divide the diameter by 2.
r=7 Ă· 2 = 3.5
This means that the radius of the circle is 3.5 cm. Remember that the circumference of a circle with radius r is calculated using the formula below.
C=2Ď€ r
By substituting 3.5 for r in the formula, we can calculate C.
The circumference of the circle is approximately 7Ď€cm.
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More About Circles!
Are you interested in learning more about circles? Our Mathleaks original content can teach you all about them! Check out the following resources to see real-world uses for circumference and area, how circles compare to other shapes and why, as well as some higher level topics that you can look forward to learning about in Geometry and Algebra 2.
