## Unit 7: Triangle Basics and Congruent Triangles

### Overview

*In prior math courses, you have learned basic properties of all triangles and how to prove triangles congruent. In this unit, you will extend that knowledge and learn to write two-column proofs to prove triangles congruent. You will also learn about and solve problems involving isosceles and equilateral triangles. These are special types of triangles that have additional properties that other triangles do not hold. For this reason, they have a lot of value in real world applications.*

**Developed By:** Gretchen Gibson

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## Pre-Unit Assessment

## Lesson 1

The Triangle Sum and Exterior Angle Theorems

## Lesson 2

Isosceles and Equilateral Triangles

## Lesson 3

Bisectors, Medians, and Altitudes

## Lesson 4

Triangle Congruence—SSS, SAS, ASA, and AAS

## Lesson 5

Proofs -- Congruent Triangles

## Lesson 6

Proofs -- Congruent Triangles (Part 2)