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.
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Draw two diameter lines, then draw a circle inside the circle.
dragons no wait... ELVES
If you define line as a straight curve then you cannot. I have seen two other variations though: you can cut a cake or any cylinder into eight pieces with three cuts or you can fold a circle into eight sections.
6 straight lines drawn inside of an octagon will divide the octagon into 8 triangles
you divide 8 by 4 which gives you 2 so you draw 4 lines across a circle and then you have it!