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Circumference – Exact Answer Using π
publish date: 2026/05/17 03:18:33.777876 UTC
volume_mute
Find the exact circumference of the circle shown. Leave the answer in terms of \(\pi\).
Correct Answer
\(10\pi\) cm
Explanation
Substitute \(r = 5\) into \(C = 2\pi r\):
\[C = 2\pi(5) = 2(5)\pi = 10\pi \text{ cm}\]
The exact circumference is \(10\pi\) cm. The product is written with \(\pi\) as the last factor.
Reference
Mathematics for college students