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Tenemos:
angulo exterior del polígono regular = α = 40°
numero de lados polígono regular = n
numero de diagonales del polígono regular = D
Utilizar: α = 360° / n
40° = 360° / n
n = 360° / 40°
n = 9
Utilizar: D = n(n - 3) / 2
D = 9(9 - 3) / 2
D = 9(6) / 2
D = 54 / 2
D = 27