Question

An outside circular ring has a circumference of 200 cm. What is the circumference of an inner ring which is 25 cm shorter in radius? Both circles have the same center.

Answer 1

Okay. We know that circumference is 2(pi)r
Make an equation. 2(pi)r = 200
Calculate radius.
Now can you do it?

Answer 2

idk how to do radius

Answer 3

(pi)r = 100
r = 100/pi
What do I take as the value of pi?

Answer 4

3.14

Answer 5

r = 100/3.14
Rest you can solve.