What is the arc measure of an arc with length 4.189 cm and radius equal to 3 cm.'?

Given that the arc length is 4.189 cm and the radius is 3 cm, the size of the arc will found as follows;

C=theta/360 πd

suppose:

size of arc=theta=x

d=3*2=6 cm

hence;

4.189=x/360*π*6

4.189=0.0524x

x=4.189/0.0524

x=80.004°

The size of the arc length is 80.004°