Khan Academy on a Stick
Intro to 30-60-90 triangles
A few more 45-45-90 examples and an introduction to 30-60-90 triangles.
If the above player doesn't work, try this direct link.
A few more 45-45-90 examples and an introduction to 30-60-90 triangles.
If the above player doesn't work, try this direct link.