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Old 01-07-2012, 02:27 PM   #31
Retired carpenter
Join Date: Dec 2011
Location: Portland, Oregon
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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:

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:

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



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