Lesson: Congruent Triangles Mathematics

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In this lesson, we will learn how to prove that two triangles are congruent using either the side-angle-side (SAS), the angle-side-angle (ASA), the side-side-side (SSS), or the right angle-hypotenuse-side (RHS) criterion and determine whether angle-side-side is a valid criterion for triangle congruence or not.

Lesson Plan

Students will be able to

prove that two triangles are congruent when
- two sides and the included angle are equal (),
- two angles and the included side are equal (),
- their three sides are equal (),
- they have a right angle, and the hypotenuse and one other side are equal (),
understand why is not a valid condition of congruence.