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Find the angle in radians through which a pendulum swings if its length is 75 cm and the tip describes an arc of length

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Find the angle in radians through which a pendulum swings if its length is 75 cm and the tip describes an arc of length 

(i) 10 cm 

(ii) 15 cm 

(iii) 21 cm.

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Given radius = 75 cm 

We know that θ = \(\frac{arc}{radius}\)

(i) Given length of arc = 10 cm

(ii) Given length of arc = 15 cm

(iii) Given length of arc = 21 cm

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