Circle - simple

The circumference of a circle is 198 mm. How long in mm is its diameter?

Correct answer:

D =  63.03 mm

Step-by-step explanation:

$$\begin{gathered} o=198\text{ mm } \\ o=\pi D=2\pi \cdot r \\ D={\displaystyle \frac{o}{\pi }}={\displaystyle \frac{198}{3.1416}}=63.03\text{ mm} \end{gathered}$$

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