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

Explanation

To find the angle in radians through which a pendulum swings, we can use the formula that relates the arc length (s), the radius (r), and the angle in radians (θ):

\[ θ = \frac{s}{r} \]

where:
- \( s \) is the arc length,
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