Paul.

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 Trigonometry

The side opposite the right angled triangle is known as the //Hypotenuse//, which is also the longest side.
=== If you stand at //A// in the triangle //ABC//, the side //BC// is //opposite// to you and the side //AB// is next to you. We therefore say that //BC// is the **opposite side** to angle //A// and //AB// is the ** //adjacent// side** to angle //A// .===





If you have trouble remembering the definitions, just remember **SOH CAH TOA**.
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> History of Trigonometry > > > == The History of Trigonometry dates back to Egyptian and Babylonian times. Most angles in that time was measured in degrees. And from there a lot of advances in trigonometry has been made by many Greek astronomers. == > > == And these Greek astronomers made a trigonometric table that they would use to measure the length of the chord, which also took into account a variaty of different angles in a circle of a fixed radius. This was was all done in increasing the degrees of 71. == > > == In the fifth century a astronomer named Ptolemy to all this finding further by creating the table of chords with increasing one degree. And this was known as Menelaus's theorem and this discovery lead to Trigonometric studies for the next three century's, all around, give or take the same period. == > > == And in the other case Indian Mathematicians created the sine function instead of the chords that was used and invented first. But the sine function was not seen as a ratio but the opposite of an angle in a right angle of fixed hypotenuse. There was also a Muslim astronomer who compiled information and studies of both previous discovery's of the Greeks and the Indians. == > > == And finally in the thirteen century, the Germans further modified and studied and learn t more about the Trigonometric functions and how they could be applied and defining Trigonometric functions as ratios rather than the lengths of lines. And after the Swedish astronomers discovery the logarithms, Trigonometry took another big step with Issac Newton. == > > == He founded differential and integral calculus. Euler used complex numbers to explain trigonometry functions and this is seen in the formation of the Euler's formula.The history of trigonometry came about mainly due to the purposes of time keeping and astronomy. ==



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