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More Geometry Lessons

More Lessons for Grade 9 Math

Two-Column Proofs

Videos, solutions, worksheets, games and activities to help Grade 9 Geometry students learn how to use two column proofs.

**Two Column Proofs**

Two column proofs are organized into statement and reason columns. Each statement must be justified in the reason column. Before beginning a two column proof, start by working backwards from the “prove” or “show” statement. The reason column will typically include “given”, vocabulary definitions, conjectures, and theorems.

**How to organize a two column proof?**

Writing Your First Two-Column Proof

This video outlines the process for writing a flow and two-column proof.

**Geometry Proofs - Two Column Proofs**

Students learn to set up and complete two-column Geometry proofs using the properties of equality as well as postulates and definitions from Geometry.

**Two column proof showing segments are perpendicular**

Using triangle congruency postulates to show that two intersecting segments are perpendicular.

This video provides a two column proof of the isosceles triangle theorem.

**This video provides a two column proof of the exterior angles theorem**

**Geometric Proofs**

Learn to prove geometric statements using two column proofs.

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