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Abramowitz, M. New York: Dover, pp. Bahm, L. The New Trigonometry on Your Own. Beyer, W.

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Borchardt, W. A New Trigonometry for Schools. London: G. Bell, Dixon, R. Hobson, E. A Treatise on Plane Trigonometry.

Some rules/guidelines for trigonometry of right triangles

London: Cambridge University Press, Kells, L. Plane and Spherical Trigonometry. New York: McGraw-Hill, Maor, E. Trigonometric Delights. Morrill, W.

Basic Trigonometry

Plane Trigonometry, rev. Dubuque, IA: Wm. Brown, Robinson, R. Monthly 64 , , Siddons, A. Trigonometry, Part I. London: Cambridge University Press, a. Trigonometry, Part II. London: Cambridge University Press, b. Trigonometry, Part III.

trigonometry | Definition, Formulas, Ratios, & Identities |

London: Cambridge University Press, c. Trigonometry, Part IV. London: Cambridge University Press, d. Sloane, N. The unit circle is a circle with a radius of 1 unit in length—hence its imaginative name. When you work with the unit circle, you don't use the regular and trusted Cartesian coordinate system; instead you use a polar coordinate system.

The Cartesian system works great in a rectangular grid space, where a point can be located by a coordinate, such as x, y. The unit circle has its origin at its center, and you measure angles of rotation beginning at the right-middle edge of the unit circle facing 3 o'clock and moving in a counterclockwise direction around it. You can use pi also to measure around the unit circle, as illustrated in the figure.

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The number pi is a constant that is equal to the circumference of a circle divided by its diameter, and is approximately 3. In the polar system, you use radians to measure angles, instead of degrees. It's nice to know the arc length, but most of the time in computer graphics , you really just want to know the location of a point in relation to the unit circle.

For example, if I wanted to rotate a point around the unit circle, I'd need to know how to place and move the point in a circle. With the unit circle, this is an incredibly easy task and precisely the kind of thing trig is used for. There is a really simple relationship between the trig functions and the unit circle.

Introduction to Trigonometry

Notice in the unit circle diagram that from point p on the ellipse, a right triangle is formed within the unit circle. This should immediately make you think of good old Pythagoras. Notice also that r the radius is the hypotenuse of the right triangle. In addition, you now also know that with the trig functions, you can use theta and any one side opposite, adjacent, or hypotenuse to solve the rest of the triangle.

The big payoff of these relationships, for our purposes, is that to translate point p in the polar coordinate system to the Cartesian coordinate system the system used by our monitors , you would use these simple expressions:. These seemingly humble little expressions are very powerful and can be exploited for all sorts of expressive and organic purposes.