Table of Constants
Values outside the angle range are trivially derived from these values, using circle axis reflection symmetry. (See Trigonometric identity.)
In the entries below, when a certain number of degrees is related to a regular polygon, the relation is that the number of degrees in each angle of the polygon is (n–2) times the indicated number of degrees (where n is the number of sides). This is because the sum of the angles of any n-gon is 180°×(n–2) and so the measure of each angle of any regular n-gon is 180°×(n–2)÷n. Thus for example the entry "45°: square" means that, with n=4, 180°÷n = 45°, and the number of degrees in each angle of a square is (n–2)×45° = 90°.
Read more about this topic: Exact Trigonometric Constants
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