Exterior Angle Inequality Theorem With Two Column Proofs – Geometry

This geometry video tutorial provides a basic introduction into the exterior angle inequality theorem. It explains how to use it in a two column proof situation.

Triangle Congruence – SSS, SAS, ASA: https://www.youtube.com/watch?v=jWHOF6cFbpw

CPCTC – 2 Column Proofs With Triangles:

Hypotenuse Leg Theorem – HL Postulate:

Detour Proofs – Double Triangle Congruence:

The Midpoint Formula:

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Missing Diagrams – 2 Column Proofs:

Right Angle Theorem – SSS & SAS:

Perpendicular Bisector Theorem:

Altitude, Median, Midpoint & P. Bisector:

Parallel & Perpendicular Lines – Slope:

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Indirect Proofs – Example Problems:

Proving Parallel Lines With Proofs:

The Exterior Angle Theorem:

Polygons:

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