Unit 4 · Triangle Foundations

Unit 4 — Triangle Foundations

Build a complete foundation in triangle properties: classification, angle theorems, the triangle inequality, and the special properties of isosceles and equilateral triangles.

8 lessons7 learning objectives

Learning Objectives

Goal 1Classify triangles by side lengths.

Goal 2State the Triangle Angle Sum Theorem.

Goal 3Identify exterior angles and remote interior angles.

Goal 4State the Triangle Inequality Theorem.

Goal 5Define congruent figures.

Goal 6Identify the legs, base, and base angles of an isosceles triangle.

Goal 7State the properties of equilateral triangles.

Lessons

4.1Classifying Triangles

4.2Triangle Angle Sum Theorem

4.3Exterior Angle Theorem

4.4Triangle Inequality Theorem

4.5Congruent Figures and Corresponding Parts

4.6Isosceles Triangles

4.7Equilateral Triangles

4.8Unit 4 Review