Geometry A

Parallel Lines Unit

Brightstorm video on Adjacent Angles.
Brightstorm video on Vertical Angles.
Brightstorm video on Corresponding Angles.
Brightstorm video on Alternate Interior Angles.
Brightstorm video on Alternate Exterior Angles.
Brightstorm video on Same Side Interior and Same Side Exterior Angles.
Brightstorm video on the Converse of the Parallel Lines Theorem.

Constructions Unit:

This site is excellent for Geometry because it has a lot of construction applets that allow you to see step-by-step examples of basic constructions.

Triangle Congruence Unit:

BrightStorm videos on Triangle Proofs

This link will take you to videos that will help you with doing triangle congruence proofs. There are videos on SSS, SAS, ASA, AAS and HL. There is also a video on CPCTC as well as two column proofs.

BrightStorm videos on Triangle Properties

This link will take you to videos that will help with some triangle properties that might come up while you are doing proofs.

Similar Triangles Unit:

Brightstorm videos on similar triangles

This link will take you to videos that will help with ratios, proportions and similar triangles.