Obtuse. All regular polygons with more than 4 sides are obtuse-angled.
Why? Think about a square...
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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.
In a regular nonagon there are 9, if its irregular its dependant.
4right angles
No
Nine of them.