Question

If $A$ pendulum swings through an angle of ${30}^o$ and describes an are of $8.8cm$ in length. Find the length of pendulum.

Answer 1

(arc)=(length) $\times$ (angle in radians)

8. 8 = length$\times \frac{\pi }{6}$

length = $\frac{8.8\times 6}{\pi }=16.8cm$