A nonagon has 9 sides. It can have one or more 90 degree angles. If it is a regular nonagon then it has 180*7/9 for the interior angle measures which is 140 degrees.
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No a quadrilateral does not have any rightangles.
A nonagon has 9 angels ;)
No.
In a regular nonagon there are 9, if its irregular its dependant.
A nine sided nonagon has 27 diagonals