Question

The minut hand of a clock is 3.5 cm long calculate the swept by it in 20minutes

Answer 1

The length of the minute hand is equal to the radius of the circle the minute hand sweeps ⇒ 60 mins = πr^2

⇒ 20 mins = πr^/3

substituting the values r = 3.5 cm

⇒πr^/3 = 12.828 cm^2