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 //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.
MEMORY METER
This indicates how strong in your memory this concept is
6
• 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.
MEMORY METER
This indicates how strong in your memory this concept is
1
• Video

Two Column Proofs Principles

by CK-12 //at grade
This video gives more detail about the mathematical principles presented in Two Column Proofs.
MEMORY METER
This indicates how strong in your memory this concept is
3
• 3
• Critical Thinking

Two-Column Proofs Discussion Questions

by CK-12 //at grade
A list of student-submitted discussion questions for Two-Column Proofs.
MEMORY METER
This indicates how strong in your memory this concept is
0
• 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.
MEMORY METER
This indicates how strong in your memory this concept is
2
• 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).
MEMORY METER
This indicates how strong in your memory this concept is
4