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.
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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.
A 'nonagon' is any closed figure with nine sides. Its interior angles always add up to 1,260°, so it could have several right angles in it. But if it's a 'regular' nonagon, then every interior angle is 140°.
In a regular nonagon there are 9, if its irregular its dependant.