Q. 74.3( 105 Votes )

# Find the angle in

Answer :

(i) Given: l = 10cm (length of arc) and r = 75cm(radius of circle)

We know that θ = (here, θ is angle subtended by arc)

θ = = radians

The angle by which the pendulum of length 75 cm swings if it describes an arc of 21 cm is radians.

(ii) Given: l = 15cm (length of arc) and r = 75cm(radius of circle)

We know that θ = (here, θ is angle subtended by arc)

θ = = radians.

The angle by which the pendulum of length 75 cm swings if it describes an arc of 21 cm is radians.

(iii) Given: l = 21 cm (length of arc) and r = 75 cm (radius of circle)

We know that θ = (here, θ is angle subtended by arc)

θ = = radians

The angle by which the pendulum of length 75 cm swings if it describes an arc of 21 cm is radians.

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