Trigonometric Ratios This video teaches how to identify the opposite side, adjacent side and hypotenuse. It also defines the trigonometric ratios: sine, cosine, and tangent, as well as works through some examples showing how to find each trig ratio.
Trig Ratios of Complementary Angles This video discusses the fact that the sine of an angle is equal to the cosine of its complement and vice versa. Stop watching the video at 3:31. This video reinforces the concepts taught in the second part of the #7 notes.