Indirect Proofs in Algebra and Geometry: Examples (Basic Geometry Concepts)

Here you'll learn how to write indirect proofs, or proofs by contradiction, by assuming a hypothesis is false.

This video provides the student with a walkthrough of one or more examples from the concept "Indirect Proof in Algebra and Geometry".

This is part of CK-12’s Basic Geometry: Triangle Relationships. See more at:

1. Midsegment Theorem:

2. Perpendicular Bisectors:

3. Angle Bisectors in Triangles:

4. Medians:

5. Altitudes:

6. Comparing Angles and Sides in Triangles:

7. Triangle Inequality Theorem:

8. Indirect Proof in Algebra and Geometry: