### Trigonometric Functions

Trigonometry is a field of mathematics, whose term is derived from geek: *trigon*
(triangle) and *metron* (measure) that is the triangle measures. The triangle has three sides and three angles.
The longest side of a right triangle is called hypotenuse. If the measures of two sides are known, we use the
Pythagorean Theorem to calculate the length of the hypotenuse.

The formula of the Pythagorean Theorem is c^{2} = a^{2} + b^{2}, where hypotenuse = c = √ a^{2}+b^{2}) .

The measures of angles can be expressed in radians or degrees.

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