Q. 234.2( 5 Votes )

The length of the A. 231 cm2

B. 210 cm2

C. 126 cm2

D. 252 cm2

Answer :

Length of the minute hand of a clock = 21 cm


Radius = R = 21 cm


In 1 minute, minute hand sweeps 6°


So, in 10 minutes, minute hand will sweep 10 × 6° = 60°


Area swept by minute hand in 10 minutes = Area of a sector of angle of a circle with radius R = = 22/7 × 21 × 21 × 60/360 = 231 cm2

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