The length of the minute hand of a clock is $7\,cm$. The area of the region swept by it in $20$ minutes is $\ldots \ldots \ldots . cm ^{2}$.
The length of the minute hand of a clock is $7\,cm$. The area of the region swept by it in $20$ minutes is $\ldots \ldots \ldots . cm ^{2}$.
- A
$154$
- B
$77$
- C
$\frac{154}{3}$
- D
$\frac{77}{3}$
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