pls explain statement

Asked by akheelfiroz | 4th Dec, 2009, 11:24: AM

Expert Answer:

 

Given - PQ is the diameter of the circle with centre O; CD and AB are the tangent lines at P and Q.

To prove – CD ||AB
OP  CD or PQ is  CD (Tangent at a point is  to the radius)
Similarly, PQ  AB
CPQ = PQB = 90o
These are alternate angles.
Hence CD|| AB

Answered by  | 4th Dec, 2009, 12:24: PM

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