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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

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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• Video

## Two Column Proofs Examples

This video shows how to work step-by-step through one or more of the examples in Two Column Proofs.
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## Two Column Proofs Principles

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

## Two-Column Proofs Discussion Questions

A list of student-submitted discussion questions for Two-Column Proofs.
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• Real World Application

## Give Me One Reason

You can use fact-based reasons to strengthen your arguments and build convincing statements.
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• Study Guide