The radius of a circle is 9 kilometers. What is the length of a 135° arc?

Question

how many kil. would that be?

Answer 1

There are 360o in the entire circle, which is given as 9km. One way to go is to set up a proportion:

135^o / 360^o = x / 9km

x = (135/360)• 9km = 3.375km