The length of a minute hand of a clock is 7cm. The area

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The length of a minute hand of a clock is 7cm. The area swept by the minute hand in 30 minutes is :

1. 210 sq.cm
2. 154 sq.cm
3. 77 sq.cm
4. 147 sq.cm

Correct Option: C

Area swept by the minute hand in an hour = πr²
Here , r = 7 cm

∴ Required area =	πr²
	2

∴ Required area =	22 × 7 × 7	= 77 sq. cm.
	7 × 2