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180(n - 2)/n
Angulo Exterior:
360/n
180(n - 2)/n 7
---------------- = ---
360/n 2
180(n - 2)(n) 7
----------------- = ----
(n)(360) 2
360(n - 2) = 2,520
360n - 720 = 2,520
360n = 3,240
n = 9