Answer:

Explanation:
Step 1:
Calculate the circumference of both circles.
The formula of a circumference:of a circle with radius r:

The circle R:

The circle S:

The length of the intercepted arc for circle R is

Step 2:
Calculate what the part of the circumference of the circle R is the intercepted arc:

The same length of the circumference of the circle S is searched for the length of the intercepted arc for circle S.
Step 3:
Calculate the length of the intercepted arc for circle S:
