Module 01 — Geometry Foundations
A geometry theorem creates a relationship. Substitution replaces something with a known equal value. A Property of Equality performs the same operation on both sides. Transitive links A to B and B to C. The definition of congruent angles changes equal measures into congruent angles.

If the problem asks you to prove the Vertical Angles Theorem, do not cite that theorem. Build the proof from two linear pairs.

For each multiple-choice question: 1. name the topic; 2. point to the diagram clue or proof move; 3. state the rule; 4. solve only if math is needed; 5. choose the answer that matches your reasoning.

After this four-question check, use the final card to take the complete practice exams.
Take the 15-question Part One practice exam. Retry every miss after reading its explanation. When you are ready, take the real Part One assessment in Canvas.