A nanogon has no diagonals because there is no such shape.
A nonagon, on the other hand, has 9*(9-3)/2 = 27 diagonals.
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First of all its not NANOGON its NONAGON......... A nonagon has 9 sides..
I donno :P
It has 2 diagonals
It has 9 diagonals
A nonagon is a polygon with 9 sides