In a regular nonagon there are 9, if its irregular its dependant.
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4right angles
A convex nonagon can have between zero (0) and three (3) right angles. A general nonagon can have between zero (0) and six (6) right angles.
A nonagon has 9 interior angles that add up to 1260 degrees
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.
Nine of each.