Question

A pendulum swings through an angle of 30° and describes an arc 17.6cm in length find the length of pendulum

Answer 1

by using formula 2pie r × 30degree/360degree=17.6 cm
u will get the value of r
r=657.6 cm ( approx)

Answer 2

30°/360°*2πr=17.6 cm
1/12*2πr=17.6 cm
1/6*πr=17.6 cm
r=17.6 cm*6*7/22=0.8 cm*6*7=33.6 cm