$A$ wheel of radius $30 \ cm$ rotates about its axis and undergoes an angular displacement of $30^\circ$. The linear distance covered by the wheel is .......
- A$\frac{\pi}{10} \ m$
- B$\frac{\pi}{20} \ m$
- C$\frac{\pi}{30} \ m$
- D$\frac{2\pi}{30} \ m$
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