Geometry is the study of shapes and space, and particularly of symmetry. In this chapter, you’ll look mostly at the practical side of the subject, however, beginning with the measurement of angles and triangles. This area of mathematics is trigonometry. When programming anything involving movement, such as games, you constantly use trigonometry. In fact, it is so important that you must have a thorough understanding of how it works.

An *angle* is a way to measuring a direction. If two people set off from the same point, after they have both traveled 10 meters, they can be anything from zero meters apart (if ...

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