A A\,A and C C\,C are points on a circle, centre OOO. AB AB\,AB and BC BC\,BC are tangents to the circle.

Prove that triangle ABO ABO\,ABO is congruent to triangle BCOBCOBCO.
Practise Edexcel GCSE Maths Congruent Triangles with exam-style questions for Foundation and Higher tier. 28 questions, matched to the Edexcel GCSE Maths (1MA1) specification and written in Paper 1, Paper 2 and Paper 3 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.