$S_1$ and $S_2$ are two concentric circles of radii $1$ and $2$ respectively. Two parallel tangents to $S_1$ cut off an arc from $S_2$. The length of the arc is
$S_1$ and $S_2$ are two concentric circles of radii $1$ and $2$ respectively. Two parallel tangents to $S_1$ cut off an arc from $S_2$. The length of the arc is
- A
$\frac{\pi }{2}$
- B
$\frac{2\pi }{3}$
- C
$\frac{3\pi }{4}$
- D
$\frac{\pi }{4}$
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- [JEE MAIN 2021]
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