E E\,E and F F\,F are points on a circle with centre CCC. ED ED\,ED and FD FD\,FD are tangents to the circle.
Prove that triangle CED CED\,CED is congruent to triangle CFDCFDCFD.
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.