The radius, diameter, or circumference of a circle is given. Find the missing measures.Round to the nearest hundredth if necessary.r= 9.4 mm, d = ?, C = ?O d = 4.7 mm, C = 29.53 mmO d = 18.8 mm, C = 29.

Kapil Thakkar asked May 16, 2023

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Kapil Thakkar asked May 16, 2023

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22 votes

The diameter, d, is calculated as follows:

$d=2\cdot r$

where r is the radius. Substituting with r = 9.4 mm, we get:

$\begin{gathered} d=2\cdot9.4 \\ d=18.8\operatorname{mm} \end{gathered}$

The circumference of a circle, C, is calculated as follows:

$C=2\pi r$

Substituting with r = 9.4 mm, we get:

$\begin{gathered} C=2\pi\cdot9.4 \\ C\approx59.06\operatorname{mm} \end{gathered}$

Stan Shaw answered May 21, 2023

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