The area of a triangle.
Similar figures. All functions from one function. Complements. Cofunctions.
18. The Law of Sines
19. The Circle
The definition of π. The remarkable π/4.
The method of rearranging.
11. Evaluating π
The ratio of a chord to the diameter.
Degree measure. Standard position.
13. Radian Measure
Radians into degrees. Degrees into radians. Coterminal angles. The multiples of π.
14. Arc Length
The definition of radian measure. s = rθ.
The analytic definition of the trigonometric functions.
The corresponding acute angle.
17. Line Values
The zeros of sin θ. The period of a function.
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