13. Calcule:
A) a medida do ângulo interno de um triângulo equilátero
B) a soma das medidas dos ângulos internos de um polígono de 13 lados.
C) a medida do ângulo interno de um octógono regular.
D) a medida dos ângulos externos de um decágono regular.
E) a soma das medidas dos ângulos externos de um polígono regular de 12 lados.
Como posso calcular estas questões?
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