Question

the area swept by a minute hand of clock of length 7 cm on 20 minutes is cm^2

Answer 1

For a minute hand, 60 minutes is equivalent to 360

0

and so 30 minutes will be 180

0

.

Area swept in 60 minutes is area of full circle.

So area swept in 30 minutes will be area of half circle.

Thus, area swept is

1/2x(22/7)x 7square= 77 cmsquare