Cut/draw 21 lines from the center out.
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The three parts are:the interior of the circle, the points on the circle (points on its circumference) the outside of the circle.
Only the diameter can divide the circle in to two equal parts.
Construct a circle with a 4.5 radius. The circle's circumference is 360 degrees. So mark out 3 by 120 degrees on the circumference and join them to the centre of the circle which will divide the circle into three equal parts.
A circle divided into 12 parts will have 12 arcs of 30 degrees around its circumference.
There are 2pi in a circle. If we divide a circle into 8 equal parts, then each part will be pi/4, [(2pi)/8].