Question

The length of a minute arrow of a wall clock is 20cm, what distance will the tip of arrow have moved in one hour? (use π =3.14)

Answer 1

Answer:

ANSWER

In 60 minutes, minute hand completes 360

0

i.e., one rotation.

⇒ in 1 minute, minute hands completes

60

360

∘

=6

∘

Hence, in 5 minutes the angle covered is is 6×5=30

o

.

The angle of sector formed is 30

o

.

The area swept by the minute hand in 5 minutes=

360

30

×π×14×14

Using π=

7

22

, we get

The area swept by the minute hand in 5 minutes =

3

154

sq. cm