Its circumference
Its diameter
Its radius
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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.
You can cut a round cake into eight parts with three cuts, but you can't cut a circle into eight parts with three straight lines.
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.
Draw two diameter lines, then draw a circle inside the circle.
A circle has 360 degrees inside it, 360/3=120. Cut the circle up so that there are three 120 degree angled wedges and you have 3 equal parts.