Question

The length of the minute-hand of a wall clock is 10.5 cm. Find the area swept
by the minute-hand in 20 minutes.​

Answer 1

Answer:

21.99114857512855266

Answer 2

Answer:

length of minute hand =10.5cm

i.e. radius of sector=10.5cm

1 minute =6°

20 minutes=20×6

=120°

Area of sector =x/360×πr²

=120/360×22/7×10.5×10.5

=1/3×22×1.5×10.5

=22×1.5×3.5

=115.5cm²

In 20 minutes area swept by minute-hand =115.5cm²