Question

A pendulum swings through an angle of 36° and describes an arc 13.2 cm in length. Then, the length of the pendulum is (a) 21 cm (b) 22 cm (c) 25 cm (d) 24 cm​

Answer 1

Answer:

option a

Step-by-step explanation:

Here,

θ=36°

l=arc=13.2 cm

l= (θ/360)*2πr

13.2=(36/360)*2πr

r=(5*13.2*7)/22 (π=22/7)

r= length of the pendulum =21 cm