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easiest way i know of....
you need a protractor, ruler, and something to mark with.
measure top/bottem, left/right to find center point from inside of circle.
lets say your staring with 0 degrees.
place far left end of proteactor at 0, use ruler to run out from center at 120 degrees, mark spot, relocate protector, remark at 120 again, the repeat for third spot. wala all done.
or you can eyeball it, just depends how accurate you want it, but for three points, each mark is 120 degrees from the other two.
so one mark at 120, 240 and 360/0 degrees.
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