No because a nonagon which is a 9 sided shape has 27 diagonals
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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.
No but its diagonals intersect each other at 90 degrees
The diagonals of a rhombus are perpendicular and intersect each other at right angles which is 90 degrees
The only regular polygon with an interior angle of 90 degrees is the square, which has four sides. Other polygons can have an interior angle of 90 degrees, but they would not be regular polygons.
90 degrees