Unit 7: Triangle Basics and Congruent Triangles


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)

Post-Unit Assessment