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SUMA DE ANGULOS INTERNOS = (n - 2)×180°
SUMA DE ANGULOS EXTERNOS = 360° SIEMPRE....
entonces:
(n - 2)×180° - 720° = 360°
(n - 2)×180° = 1080°
(n - 2)×18 = 108
(n - 2) = 108 / 18 = 6
n - 2 = 6
n = 8
rspta. el poligono tiene 8 lados
se llama octagono.
suerte XD