Abstract
This chapter discusses trigonometry for right triangles and oblique triangles. For angles θ between 0 and 1/2π, the trigonometric functions can be interpreted as ratios of sides of a right triangle, one of whose angles is θ. According to the law of cosines, for a triangle with sides a, b, and c, c2 = a2 + b2 − 2ab cos γ. This is a generalization of the Pythagorean Theorem, for if γ is a right angle, then cos γ = 0 and the formula says that c2 = a2 + b2. The chapter also describes the use of the law of sines and the law of cosines for triangles.
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