If a circle’s circumference is 28.26 inches, what would be the best estimate of its diameter?

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asked Oct 19, 2019 88.8k views

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Grantmcconnaughey · Answer 1 · 2019-10-25T06:03:35+0000

$\bf \textit{circumference of a circle}\\\\ C=2\pi r\quad \begin{cases} r=radius\\ -----\\ C=28.26 \end{cases}\implies 28.26=2\pi r\implies \cfrac{28.26}{2\pi }=r \\\\\\ \cfrac{14.13}{\pi } =r$

now, that's just the radius, recall the radius is half the diameter, so the diameter is twice as much as the radius, so the diameter is two times that much.

If a circle’s circumference is 28.26 inches, what would be the best estimate of its diameter?

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