Two Column Proofs – Proving Isosceles Trapezoids – Geometry

This geometry video tutorial explains how to use two column proofs to do prove if a figure is indeed an isosceles trapezoid. Theorems used in this video include the vertical angle theorem, the AAS triangle congruence postulate, CPCTC, and the reflexive property.

Polygons:

Angles of Regular Polygons:

Quadrilaterals:

Parallelograms:

Rectangles – Special Quadrilaterals:

Isosceles Trapezoids:

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The Rhombus:

Kites:

Proving Parallelograms:

Proving a Quadrilateral Is a Kite:

Proving a Quadrilateral Is a Rhombus:

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2 Column Proofs – Quadrilateral:

Skew Lines:

Points, Lines, Planes, & Segments:

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