Explicación paso a paso:
Diagonales= n(n-3)/2
n(n-3) / 2 = 9
n(n-3) = 18
n= 6
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Explicación paso a paso:
Diagonales= n(n-3)/2
n(n-3) / 2 = 9
n(n-3) = 18
n= 6