Question

the length of minute hand on a wall clock is 7 cm. find the area swept by the minute hand in 30 minutes ​

Answer 1

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For a minute hand, 60 minutes is equivalent to 360° and so 30 minutes will be 180 °

Area swept in 60 minutes is area of full circle.

So area swept in 30 minutes will be area of half circle.

$\sf \: Thus \: area \: swept = 2 \times \frac{22}{7} \times 7 \times 7 = \frac{ {77cm}^{2} }{?}$

Hope it helps you.....