SSS, SAS, ASA, & AAS Triangle Congruence

In this lesson, you will learn about the four ways to check for triangle congruence: side side side, side angle side, angle side angle, and angle angle side. The video shows you how to identify and label information given in a triangle, then use that information to prove that two triangles are congruent. By understanding these four methods, you will be able to confidently solve any proof involving triangle congruence.

Learn about the four ways to check for triangle congruence.

• What are SSS, SAS, ASA, and AAS in Geometry?
• How do you prove that two triangles are congruent?
• What is the difference between AAS and ASA?
• How do you write a two-column proof of triangle congruence?
• Given that S is the midpoint of QT and QR is parallel to TU, how do you prove that triangle QSR is congruent to triangle TSU?
• What does it mean when two parallel lines are cut by a transversal?
• What is true about alternate interior angles?
• How do you start a triangle congruence proof?
• What is the first statement in a congruence proof?
• What do you write under the reason column in a two-column proof?