# what is the circumference of the circle C3 in cm?

In the given diagram, PQ is a diameter of the circle C.K, L and M are the centres of the circle C_{1}, C_{2} and C_{3} respectively and the said points are situated on PQ. If the circumference of the circles C, C_{1} and C_{2} are 18p, 4p and 6p cm respectively, then what is the circumference of the circle C_{3} in cm?

- 8π
- 7π
- 6π
- 5π