# Two-Column Proofs

## Geometric proofs are among the building blocks of math. Learn how to use two column proofs to assert and prove the validity of a statement.

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Basic Students matched to this level have a partial mastery of prerequisite knowledge and skills fundamental for proficient work.
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Advanced Students matched to this level are ready for material that requires superior performance and mastery.

## Two-Column Proofs

by CK-12 //basic
Write two-column proofs.
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## Two-Column Proofs

by CK-12 //at grade
This concept teaches students how to write two-column proofs, and provides proofs for the Right Angle Theorem, Same Angle Supplements Theorem, and Vertical Angles Theorem.
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## Two-Column Proofs

by Rush Pat //basic
Write two-column proofs.
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• Video

## Two Column Proofs Examples

by CK-12 //at grade
This video shows how to work step-by-step through one or more of the examples in Two Column Proofs.
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• Video

## Two Column Proofs Principles - Basic

by CK-12 //basic
This video provides the student with a walkthrough on two column proofs.
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• Video

## Two Column Proofs Principles

by CK-12 //at grade
This video gives more detail about the mathematical principles presented in Two Column Proofs.
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• Video

## Introduction to Proof Using Properties of Congruence

by CK-12 //basic
An introduction to proofs in geometry using a two column proof and properties of congruence.
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• Critical Thinking

## Two-Column Proofs Discussion Questions

by CK-12 //at grade
A list of student-submitted discussion questions for Two-Column Proofs.
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• Real World Application

## Give Me One Reason

by CK-12 //at grade
You can use fact-based reasons to strengthen your arguments and build convincing statements.
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• Study Guide

## Proofs Study Guide

by CK-12 //at grade
This study guide reviews proofs: algebraic proof, properties of congruence, and geometric proofs (two-column).
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