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The length of the minute hand of a clock is 14 cm. Find the area swept by the minute hand in 5 minutes.
Given:
The length of the minute hand of a clock is \( 14 \mathrm{~cm} \).
To do:
We have to find the area swept by the minute hand in 5 minutes.
Solution:
Let the angle formed at the centre be $\theta$.
Length of the minute hand of a clock $r =14\ cm$.
Time period $=5$ minutes.
This implies,
Central angle $\theta=\frac{5}{60} \times 360^{\circ}$
$= 30^{\circ}$
Area swept by the minute in 5 minutes $=$ Area of the sector formed at the centre.
Area of the sector $=\pi r^{2} \times \frac{\theta}{360^{\circ}}$
$=\frac{22}{7} \times(14)^{2} \times \frac{30^{\circ}}{360^{\circ}}$
$=\frac{22}{7} \times 196 \times \frac{1}{12}$
$=\frac{11\times28}{6}$
$=51.33 \mathrm{~cm}^{2}$
The area swept by the minute hand in 5 minutes is $51.33 \mathrm{~cm}^{2}$.
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