MAHARASHTRA Class 10: Properties of Tangents Videos | Circles

In ∆OPA and ∆OQA, 

∠APO = ∠AQO = 90^° … (tangent ⊥ radius) 

AO is common and is the hypotenuse. 

OP = OQ … (radius) 

So, ∆OPA and ∆OQA are congruent by the RHS test. 

Two tangents cab be drawn from an external point to a circle.

RC and PB are not drawn from a common external point.