Two Column Proofs - Proving a Parallelogram Is a Rhombus - Geometry

This geometry video tutorial explains how to prove if a parallelogram is also a rhombus using two column proofs.  The theorems used in this includes the vertical angle theorem, the AAS triangle congruence postulate, CPCTC, definition of an angle bisector, and the base angle theorem for isosceles triangles.

Polygons:                            
Polygons

Angles of Regular Polygons:
How To Calculate The Interior Angles ...

Quadrilaterals:                                                        
Quadrilaterals - Geometry

Parallelograms:                                                      
Parallelograms - Geometry

Rectangles - Special Quadrilaterals:                    
Rectangles - Properties of Parallelog...

Isosceles Trapezoids:                                            
Isosceles Trapezoids

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The Rhombus:                                                        
Rhombus, Basic Introduction - Geometry

Kites:                                                                        
Kites, Basic Introduction, Geometry

Proving Parallelograms:                                        
Proving Parallelograms With Two Colum...

Proving a Quadrilateral Is a Kite:                          
Proving a Quadrilateral Is a Kite - T...

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Proving Isosceles Trapezoids:                              
Two Column Proofs - Proving Isosceles...

2 Column Proofs - Quadrilateral:                          
Two Column Proofs With Parallelograms...

Skew Lines:                                                            
Skew Lines, Perpendicular & Parallel ...

Points, Lines, Planes, & Segments:                    
Points, Lines, Planes, Segments, & Ra...

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