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Tenemos:
numero de lados del polígono convexo = n
numero de diagonales del polígono convexo = D
D - n = 88°
Utilizar: D = n(n - 3) / 2
n(n - 3) / 2 - n = 88
(n(n - 3) - 2n) / 2 = 88
(n(n - 3) - 2n) = 2(88)
n(n - 3) - 2n = 176
n² - 3n - 2n = 176
n² - 5n = 176
n² - 5n - 176 = 0
n - 16
n + 11
n - 16 = 0
n = 16, si
n + 11 = 0
n = - 11, no
n = 16