The length of a minute hand of a wall clock is 10.5 cm. The area swept by it in 10 minutes would be -
5.77 cm2
59.25 cm2
57.75 cm2
51.75 cm2
51.25 cm2
In 60 minutes, minute hand goes one circle. 10 minutes it goes 1060=16 of circle
Required area = πr26=16×227×(10.5)2=57.75cm2
The length of the minute hand of a clock is 21 cm. The area swept by the minute hand in 10 minutes is
(a) 231cm2 (b) 210cm2 (c) 126cm2 (d) 252cm2