- Solving right triangles (for an angle) A written introduction to inverse trigonometric functions, which can be used to find an unknown angle of a right triangle.
- Applications of static geometry (modeling with right triangles) (4:34) Right triangle word problem with an alien and the Eiffel tower!
- Applications of static geometry (similar triangles (8:56) Similar triangles! One of the most important ideas about triangle and trigonometric functions.