Well theres a "Proper" way but in which you would take to diameter of the circle (the distance from the center to the outside edge and multiply this times pi (3.1417) then divide by 3 then measure along the outside edge. For instance if D = 12" then C=37.7004 or 37 7/10".
120 deg increments of this would be 12.5668 or 12 1/2" so ever 12 1/2" you make a mark then draw a straight line between the center and the 3 points and now you have 3 equal parts.
But not everyone understands this way so heres an easier way, It's easier to divide a circle into 12 halves by just dividing the circle in half 6 times then skip ever third line making a mark at lines 4, 8 and 12. 4, 8 and 12 will be 3 equal parts.
120 deg increments of this would be 12.5668 or 12 1/2" so ever 12 1/2" you make a mark then draw a straight line between the center and the 3 points and now you have 3 equal parts.
But not everyone understands this way so heres an easier way, It's easier to divide a circle into 12 halves by just dividing the circle in half 6 times then skip ever third line making a mark at lines 4, 8 and 12. 4, 8 and 12 will be 3 equal parts.
