Help with circle proof please!!! Watch
The question is: Prove that APB and APC are congruent (3 marks)
A B and C are points on the circumference, angle ABC= and ACB, PB and PC are tangents.
BP = CP (the lengths of tangents from a point are equal
Both triangles share the side AP
ABC=ACB and so ABC must be isosceles, and AB=AC
Therefore the triangles APC and APB must be congruent (SSS rule)