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El ángulo interior es 180 (N - 2) / N
El ángulo exterior es complementario con el interior. Su suma vale 180°
360 / N + 180 (N - 2) / N + 180 - 180 (N - 180) / N = 210°
Simplificando: 360 / N = 210° - 180° = 30°
Por lo tanto N = 12