This lesson introduces the idea of congruency applied to triangles. It brings examples of ASA, SSS, and SAS triangle postulates to check the triangles' congruency.

Learn how to use the ASA congruence theorem, and see examples that walk through sample problems step-by-step for you to improve your math knowledge and skills.

Learn about congruent triangles in this informative video lesson. Explore their parts and discover real-world examples to reinforce your knowledge, followed by a quiz.

Learn how to prove triangles are congruent using ASA or AAS, and see examples that walk through sample problems step-by-step for you to improve your math knowledge and skills.

Right triangle congruence can be proven in a number of ways, ranging from a comparison of all three sides and all three angles, or using one of the theorems (SSS, SAS, AAS, or ASA) above.

Learn how to complete proofs involving congruent triangles and the CPCTC property, and see examples that walk through sample problems step-by-step for you to improve your math knowledge and skills.

Learn about proving triangles congruent and how to do it. Learn the definition of congruent triangles, identify ways to prove triangles are congruent, and see examples of triangle proofs.

Learn how to do triangle proofs in geometry. Discover important triangle congruence theorems, and examine strategies for proving triangles congruent.

What is the HL theorem? Learn the definition and proof of the HL theorem. Learn about HL congruence and learn how to solve problems using the HL Theorem with examples.

If the information is either ASA or SAA, a proportion created using the given information into the Law of Sines will help in solving the missing sides.