A circle has a radius of 12.6 cm

What is the exact length of an arc formed by a central angle measuring 120°?

Express your answer using π

jj88778
Mar 6, 2018

#2**+1 **

Circumference = pi * d or pi * 2 r

pi * 2 * 12.6 = pi 25.2

We are looking for the fraction of the circumference that 120 out of 360 dgrees covers

120 /360 * pi 25.2 = 25.2 pi / 3

ElectricPavlov
Mar 6, 2018