L L\,L and M M\,M are points on a circle, centre KKK. LN LN\,LN and MN MN\,MN are tangents to the circle.
Prove that triangle KLN KLN\,KLN is congruent to triangle KMNKMNKMN.
20 exam-style questions on AQA GCSE Maths Congruent Triangles. Each one has a worked solution and a mark scheme showing where the marks go.