That depends how many sections you wish to divide it into.
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never tried it without my Gay lines so I wouldn't know for sure, but try 3 and see what you get
If it is a regular nonagon then it has 9 equal sides, so all you needed to do was divide 31.23 by 9. (You would have got 3.47 cm)
12 of then but if they are joined together in the form of a 6 sided hexagon then 6 endpoints are needed.
12
You would need basically a protractor and a straight edge.