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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.

Levels are CK-12's student achievement levels.
Basic Students matched to this level have a partial mastery of prerequisite knowledge and skills fundamental for proficient work.
At Grade (Proficient) Students matched to this level have demonstrated competency over challenging subject matter, including subject matter knowledge, application of such knowledge to real-world situations, and analytical skills appropriate to subject matter.
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 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.

0
• Video

Two Column Proofs Principles - Basic

by CK-12 //basic

This video provides the student with a walkthrough on two column proofs.

2
• Video

Two Column Proofs Principles

by CK-12 //at grade

This video gives more detail about the mathematical principles presented in Two Column Proofs.

3
• 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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• Practice
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Two-Column Proofs Practice

by CK-12 //at grade
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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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Two-Column Proofs Pre Read

by CK-12 //at grade

To use prior knowledge of root words to learn new vocabulary words using Etymology.

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Two-Column Proofs Post Read

by CK-12 //at grade

To stress understanding of a concept by summarizing the main idea and applying that understanding to create visual aids and generate questions and comments using a Concept Matrix.

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by CK-12 //at grade

To activate prior knowledge, make personal connections, reflect on key concepts, encourage critical thinking, and assess student knowledge on the topic prior to reading using a Quickwrite.

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by CK-12 //at grade

To organize ideas, increase comprehension, synthesize learning, demonstrate understanding of key concepts, and reinforce vocabulary using a Quickwrite.

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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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• Flashcards

Two-Column Proofs Flashcards

by CK-12 //basic

These flashcards help you study important terms and vocabulary from Two-Column Proofs.

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