here is the formula fo working out how many. (n-3)×n÷2
n=the amount of side
example:a decagon (n-3)×n÷2
10-3×10÷2
7×5
=35
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A decagon need not have any lines of symmetry. It can also have 1 or 10 lines of symmetry.
A decagon need not have any lines of symmetry. It can have 10.
Ten.
6
A dodecagon need not have any lines of symmetry. It can have a maximum of 12.