Mathematics
High School (9–10)
General
Trigonometry › Trigonometric RatiosTrigonometry › Trigonometric IdentitiesChapter 8Introduction to Trigonometry
How tall is that tree? How steep is that ramp? A right triangle holds the answer, if you know how its sides compare. In this chapter you meet the six trigonometric ratios of an angle, find their values for 0°, 30°, 45°, 60° and 90°, and prove the identities that link them, such as sin² A + cos² A = 1. Python computes the ratios and checks every identity for hundreds of angles at once.
Part of Mathematics · High School (9–10) (chapter 8)
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Trigonometric Ratios
Name the sides of a right triangle from an angle, define sine, cosine, tangent and their reciprocals, and find all six ratios when one is known.
Special Angles and Trigonometric Identities
The exact ratios of 0°, 30°, 45°, 60° and 90° from two simple triangles, and the identities that link the ratios, used to simplify and prove.