None wrote:
> Trigonometry is the measurement of triangles.  A square can be broken down 
> into eight right angle triangles.  In the eighth of a square, the Opposite 
> (O) and Adjacent (A) are the same.  So if you change the angle while 
> keeping O or A the same, it will tell you how much the new A or O should 
> be.

For efficiency, it's easier to just break a square into two triangles.
^_^  Also in a square you can't change the angles, or it ceases to be
a square.  They will always be 45 and 90 degrees.

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