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# Two-Column Proofs

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Levels are CK12'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 gives more detail about the mathematical principles presented in Basic Geometric Definitions.

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• Video

## Two Column Proofs Principles

This video gives more detail about the mathematical principles presented in Basic Geometric Definitions.

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• Practice

## Two-Column Proofs Practice

Practice Two-Column Proofs questions

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

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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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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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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

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

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• Study Guide