The minute hand of a clock is \( 10 \mathrm{~cm} \) long. Find the area of the face of the clock described by the minute hand between \( 8 \mathrm{AM} \) and \( 8.25 \mathrm{AM} \)
Given:
The minute hand of a clock is \( 10 \mathrm{~cm} \) long.
To do:
We have to find the area of the face of the clock described by the minute hand between \( 8 \mathrm{AM} \) and \( 8.25 \mathrm{AM} \).
Solution:
Let the angle formed at the centre be $\theta$.
Length of the minute hand of a clock $r =10\ cm$. Time period from 8 AM to 8.25 AM $=25$ minutes
Central angle $\theta=\frac{25}{60} \times 360^{\circ}$
$= 150^{\circ}$
Area of the face of the clock described by the minute hand between \( 8 \mathrm{AM} \) and \( 8.25 \mathrm{AM} = \) Area of the sector formed at the centre.
Area of the sector $=\pi r^{2} \times \frac{\theta}{360^{\circ}}$
$=\frac{22}{7} \times(10)^{2} \times \frac{150^{\circ}}{360^{\circ}}$
$=\frac{22}{7} \times 100 \times \frac{5}{12}$
$=\frac{11000}{84}$
$=130.95 \mathrm{~cm}^{2}$
The area of the face of the clock described by the minute hand between \( 8 \mathrm{AM} \) and \( 8.25 \mathrm{AM} \) is $130.95 \mathrm{~cm}^{2}$.
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