The minute hand of a watch is 1.5cm long. How far does its tip move in 40 minutes?
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Answered by
7
Answer:
We know that l=rθ
Hence r=1.5cm
Now we know that minute hand make 1- a revolution in 1-hour
Hence we can say
minute hand completes 360
∘
in one hour
So degree complete in
1min=
60
360
So degree complete in
40min=
60
360
×40
=240
∘
Hence θ=240
∘
Radian measure =
180
π
×θ
=
180
π
×240
=4π/3
Now l=rθ
l=1.5×4π/3
l=0.5×4π
=2π
=2×3.14
l=6.28cm
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Answered by
2
Answer:
what you asked ?
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