It is: 0.5*(92-3*9) = 27 diagonals in a 9 sided nonagon
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27 diagonals
noNo, the diagonals of a rhombus are perpendicular to each other.Unless the rhombus is regular (and called a square) the diagonals are of different lengths.
No because a nonagon which is a 9 sided shape has 27 diagonals
A nonagon may be regular or irregular.
Not a regular nonagon.