Question

The minute hand of a clock is 21 cm long. The area described by it on the face of a clock in 5 minutes is

Answer 1

Answer:

Here is the answer

Step-by-step explanation:

Given r=

21

cm

Angle made by minute hand in 1 minute =

60

360

0

=6

0

Therefore, angle made in 5 minutes = 6

0

×5=30

0

Area of the sector=

360

∘

θ

×π×r

2

Here θ=30

∘

Hence, area swept in 5 minutes =

360

0

30

0

×

7

22

×(

21

=

12

1

×

7

22

×21

= 5.5 cm