Question

minute hand of a clock in 36 cm long.
How many cms does the extremity of the minute hand move in 20 minutes time
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Answer 1

Answer:

Angle rotated in 60 mm=360

o

θ= angle rotated in 20 min⇒

60

360

×20⇒120

o

θ⇒(

3

2π

)

∴P=rθ=(42)×

3

2π

⇒28 π cm

∴ the extremity of the hand moves 28 pi cms.