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Apple QuickTime movie  |  1996-10-28  |  5.0 MB  |  160x120  |  30fps  |  58 seconds
Transcription: When trigonometry was first developed, it focused on the measurement within triangles. In fact, the very word itself has its roots in tri, gonia, and metron. Tri, gonia, metron. Three-sided measurement. And as such, the study concentrated in areas such as surveying, astronomy, and navigation. Those, of course, hold true today, but in the 1600s, The study of trigonometry broadened to a great extent by the introduction of the idea of function. And it broadened into areas that include sound waves and light rays and therefore lasers and vibrations of strings and orbits of planets and small particl ...