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∡interior 5 180(n-2)/n 360 180n - 360
------------ = --- = ---------- ► ------------- x 5 = ------------ ► 2160 = 180n
∡exterior 1 360/n n n
n=12
N° de diagonales n(n-3) 12(12-3)
------- = ------------ = 54
2 2