Our Triangles in High School Geometry (Part 1) Quick Reference Guide states all the definitions, postulates, and theorems found in a typical high school Geometry book that are associated with the following concepts:

Classifying triangles

The Sum of the Measures of the Angles in a Triangle Theorem and related concepts

Congruent triangles

Isosceles and equilateral triangles

Inequalities in triangles

The Pythagorean Theorem and related concepts

Areas of triangles

Each definition, postulate, and theorem is accompanied by an example that shows exactly what the definition, postulate, or theorem tells you.