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The trianglature formulae (2 part) was first introduced to mathematics by a forumite (forums work) and might be seen as a worthy contribution in analyzing coordinates of the circle:

 

1) radius * sqrt2 gives the hypotenuse to a right angle triangle and as the chord length of the quadrant;

 

2) chord length * pi/4 * sqrt 2 is the conversion factor giving distance on the quadrant arc.

 

I have personally found it to be a quite useful formulae.

 

 

 

"All things number and harmony." - Pythagoras

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