The relationship between the sides and angles of a general triangle is given by The Sine Rule . Using the equations descibed in this essay, it is possible to find out everything about a triangle from just a few given bits of information. Before we look at series for the Trigonometric Functions, I want to talk about angles. The system of Degrees used for normal angular measurements dates from Babylonian times. These numbers were used because they contain many factors and are easy to use.
Degrees are artificial units.
When looking at the Trigonometric Functions mathematically, we require a more fundamental unit of angular measure. This is the Radian . The Radian is defined so that a complete circle is 2 p Radians. There is a series for evaluating both Sine and Cosine. These series only work if the angle f is in Radians.