Question

Large hand of a clock is 42 cm long how many cm does its extremity move in 20 mins

Answer 1

I hope it helps ............

Answer 2

Step-by-step explanation:

It's given that the large hand of a clock is 42 cm long. And we need to find that how many centimeters does its extremity move in 20 minutes.

In 1 hour it forms a complete circle of 360°. [1 hour = 60 minutes]

For 20 minutes it will be one third of one hour i.e. 120°

[ In short ]

In 60 min = 360°

In 20 min = 360°/60 × 20 = 120°

To find how many centimeters does its extremity move in 20 minutes. We need to find the length of the arc formed by the circular movement of the hand.

i.e.

l = r∅ = 42 × 2π/3

= 42 × 2/3 × 22/7

= 12/3 × 22

= 4 × 22

= 88

Therefore, the extermity of the hand moves 88 cm in 20 minutes.