Lesson Plan: Congruence of Triangles: ASA and AAS | Nagwa Lesson Plan: Congruence of Triangles: ASA and AAS | Nagwa

# Lesson Plan: Congruence of Triangles: ASA and AAS Mathematics • 8th Grade

This lesson plan includes the objectives, prerequisites, and exclusions of the lesson teaching students how to prove that two triangles are congruent using either the angle-side-angle (ASA) or the angle-angle-side (AAS) criterion.

#### Objectives

Students will be able to

• recognize whether two given triangles are congruent,
• recognize that ASA and AAS are conditions of congruency but that SSA is not,
• recognize whether ASA or AAS can be used to prove that two given triangles are congruent,
• solve a word problem or a more complex geometric problem using ASA or AAS.

#### Prerequisites

Students should already be familiar with

• common types of triangles and polygons,
• the concepts of congruence and similarity,
• reflections, rotations, and translations,
• angle facts.

#### Exclusions

Students will not cover

• SSS, SAS, or RHS,
• applying trigonometric formulas.