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Total de diagonales:
n(n - 3)/2 = 152
n(n - 3) = 19(2)(2)(2)(2)
n(n - 3) = 19(16)
n(n - 3) = 19(19 - 3)
Entonces comparando n = 19 es un Eneadecagono
El angulo interior:
i = 180(19 - 2)/19
i = 180(17)/(19)
i = 161,05° ------>es la medida aproximada del angulo