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#D = n(n-3)/2
4n = n(n-3)2
4 = (n-3)/2
8 = n-3
11 = n.....se trata de un undecágono
Hallamos la suma de ángulos interiores:
S = 180(n-2)
S = 180(11-2)
S = 180(9)
S = 1620
Es la respuesta