Triangle Similarity – AA SSS SAS & AAA Postulates, Proving Similar Triangles, Two Column Proofs

This geometry video tutorial provides a basic introduction into triangle similarity. it explains how to use two column proofs in order to prove if two triangles are similar using the mostly the AA postulates. Other triangle similarity postulates mentioned are the AAA, SSS, and SAS postulates. Theorems used in this video include the base angle theorem, theorems associated with parallel lines, alternate interior angle theorem, vertical angles, reflexive property, definition of an altitude, right angle congruence, and more. This geometry video contains plenty of examples and practice problems on triangle similarity.

Polygons:

Quadrilaterals:

Skew Lines:

Points, Lines, Planes, & Segments:

Triangles – Basic Introduction:

Number of a Diagonals In a Polygon:

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Ratios and Proportions – Means Extreme:

Similar Triangles:

Similar Triangles – Enlargement Ratios:

Triangle Proportionality Theorem:

Altitude on Hypotenuse Theorem:

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Pythagorean Theorem:

The Distance Formula:

Distance Between 2 Points – 3D:

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