OER Applicable Text: Trigonometry is the study of the ratios of sides and angles in a right triangle. The trigonometry ratios are sine, cosine, and tangent. Sine is the ratio of the side opposite an acute angle to the hypotenuse of a right triangle. Cosine is the ratio of the side adjacent to an acute angle to the hypotenuse of a right triangle. Since these are ratios, similar triangles will have the same ratios. If you know two measurements of a right triangle, you can use these ratios to find the missing measurements. Using trig ratios and what we know about right triangles, it is possible to take just two measurements and find each of the other four for a total of three angles and three sides.
http://cms.gavirtualschool.org/Shared/Math/GSEAnalyticGeometry/RightTriangleTrigonometry/index.html
OER Video:
https://www.youtube.com/watch?v=Ujyl_zQw2zE#action=share
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