Question

The question from the chapter Circles

Answer 1

Tangent TP is parallel to chord AB.
Therefore,PB and PA both are transversal.

Angle TPA = Angle PAB [Alternative angles]
and (1)
Angle TPA = Angle PBA [Corresponding angles] (2)

By (1) and (2),
Angle PAB = Angle PBA
Therefore,PA = PB
PAB ia an isoceles triangle