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nº lados + 3 = nº de diagonales
n + 3 = n(n - 3)/2
2(n + 3) = n(n - 3)
2n + 6 = n^2 - 3n
n^2 - 3n - 2n - 6 = 0
(n - 6)(n + 1) = 0
n1 = 6
n2 = -1
Rta: hexágono ←
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