2.
the length of minute hand of a clock is 14cm. find the area swept by the minute hand in 5 minutes

Area swept by minute hand of 14 cm in 5 minutes = 51.33

Solution:

Given that length of the minute hand = 14 cm

Need to calculate the area swept by minute hand in 5 minutes.

As in 1 hour , that is 60 minutes , minute hand completes a circle .

So area swept by minute hand of 14 cm in 60 minutes = area of circle of radius 14 cm

As area of circle =

where r is radius

So area swept by given minute hand in 60 minutes =

So area swept by given minute hand in 1 minute =

And area swept by given minute hand in 5 minute =

Hence area swept by minute hand of 14 cm in 5 minutes is 51.33