Trigonometry is a branch of math that technically deals with the properties of triangles and the relationships between the lengths of their sides and their angles. Put this way, trigonometry may not sound very special, but it is, in fact, an indispensable part of your toolset as an animation or game programmer. For example, we used trigonometric functions previously in the parametric equations that produced uniform motion around a circle.

You probably remember the basics from your school days, such as the theorem that the sum of interior angles in a triangle is 180 degrees. But perhaps you may not remember what a sine function is. This section will review the essentials of the subject.

Everyone knows that ...

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