Trigonometry - Research Article from Macmillan Science Library: Mathematics

This encyclopedia article consists of approximately 6 pages of information about Trigonometry.
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Trigonometric Ratios

To understand the six trigonometric functions, consider right triangle ABC with right angle C. Although triangles with identical angle measures may have sides of different lengths, they are similar. Thus, the ratios of the corresponding sides are equal. Because there are three sides, there are six possible ratios.

Trigonometry

Working from angle A, label the sides as follows: side c represents the hypotenuse; leg a represents the side opposite angle A; and leg b is adjacent to angle A. The definitions of the six trigonometric functions of angle A are listed below.

For any angle congruent to angle A, the numerical value of any of these ratios will be equal to the value of that ratio for angle A. Consequently, for any given angle, these ratios have specific values that are listed in tables or can be found on calculators.

Basic Uses of Trigonometry. The definitions of the...

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This section contains 1,618 words
(approx. 6 pages at 300 words per page)
Buy the Trigonometry Encyclopedia Article
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Macmillan Science Library: Mathematics
Trigonometry from Macmillan Science Library: Mathematics. Copyright © 2001-2006 by Macmillan Reference USA, an imprint of the Gale Group. All rights reserved.
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