Yup, another circle question and it seems as though the question list is never-ending. Well, I'm stuck. Again... but here goes
TA and TB are tangents to the circle. C is a point on the circle. P, Q and R are the feet of the perpendicular from C to the three sides of triangle ABT
a) Name three groups of concyclic points (got this)
b) hence show that angle CRQ = angle CQP and angle CQR = angle CQP
c) if QC = 9cm and PC = 10cm, find CR.
Any help appreciated!