Unity Hypotenuse Model: Fig. WL & Fig. P

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No further questions. I found it interesting that when the hypotenuse of a right angle triangle is set to 1, it can be so useful when the sides as variable proportions are labeled differently.
 
No further questions.
Indeed - there have been no questions at all so far.

The deeper concept is that of using a unit circle as a reference object in geometry.
It's why we use "radians" for angles, for example. I don't know what you think has not been shown before.

You also get a lot of useful stuff from putting the adjacent side equal to 1.

See:
http://www.scribd.com/doc/149266846/Math-Bits
(there are typos etc since this is still a draft - but see fig 3.)