14. The length of the minute hand of a wallclock is 7 cm. How'much'are

1.	14. The length of the minute hand of a wallclock is 7 cm. How'much'area does it sweep(Foreign 2009)in 20 minutes?
Answer» The area covered by the minute hand in 60 minutes = area of the circle of radius 7 cm The area covered by minute hand in 20 minutes will be one third of the area of circlei.e.= 1/3πrr= 1/3(22/7)(77)=51.33sq.cm. like if you find it useful

14. The length of the minute hand of a wallclock is 7 cm. How'much'area does it sweep(Foreign 2009)in 20 minutes?

Answer»

The area covered by the minute hand in 60 minutes = area of the circle of radius 7 cm

The area covered by minute hand in 20 minutes will be one third of the area of circlei.e.= 1/3*π*r*r= 1/3*(22/7)*(7*7)=51.33sq.cm.

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