Trigonometric Ratios (Sine, Cosine, and Tangent) (Jump to: Lecture | Video )

Trigonometric Ratios

A Trigonometric Ratio is a ratio between the lengths of two sides of a triangle.

Figure 1.

Above we have a triangle with three angles, and three sides. With these angles and sides we can calculate the three trigonometric ratios:

Sine
Cosine
Tangent
Figure 2.

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