Question

find the area swept by minute hand of the clock of length 15 CM in 20 minutes.
plz tell me fast... plzplz​

Answer 1

As the minute hand after 20 minutes will form a sector

radius = 15cm

Angle at the centre = ???

Angle swept by minute hand in 1 minute = 6°

In 20 min, angle will be = 20×6 = 120°

So, angle at the centre = 120°

Now,

Area of sector or area swept by minute hand = theta/360° × πr^2

Area swept by minute hand = 120°/360° ×22/7×(15)^2

Area swept by minute hand = 1650/7 = 235.71428 cm^2