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Find the angle in radian 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)

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Find the angle in radian 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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as we know that arc length/ radius
(i) angle = `10/75 = 2/15` radian
(ii) angle = `15/75 = 1/5`radian
(iii)angle = `21/75 = 7/25` radian
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