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Old 01-07-2012, 02:27 PM   #31
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Gambrel math


My drawing is a bit too crammed with lines and arcs to make it easy to follow each step from the beginning.

This link shows, first, how to bisect a line, while at the same time drawing a line perpendicular to another. That was my first step to get my four quadrants. Next it shows how to bisect an angle. That's how I got my 45d angle:
http://en.wikipedia.org/wiki/Bisection

This second link shows how to trisect a right angle, while at the same time drawing an equilateral triangle. That's how I got my 60d angle:
http://www.gap-system.org/~history/H..._an_angle.html

In my drawing, I only drew enough of some circles to get the intersection points I was looking for.


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