Diameter of a cylinder

The diameter of the cylinder is 42 cm. How many times does the cylinder turn on a 66m long track?

Correct answer:

n =  50

Step-by-step explanation:

$$\begin{gathered} D=42\text{ cm}\to \text{ m}=42\mathrm{/}100\text{ m}=0.42\text{ m } \\ s=66\text{ m } \\ o=\pi \cdot D=3.1416\cdot 0.42\doteq 1.3195\text{ m } \\ n=s\mathrm{/}o=66\mathrm{/}1.3195=50 \end{gathered}$$

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