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Sagot :

Answer:

Octagon (8-sided polygon)

  • (n-2)180°
  • (8-2)180°
  • (6)180°
  • 1080°

Nonagon (9-sided polygon)

  • (n-2)180°
  • (9-2)180°
  • (7)180°
  • 1260°

Dodecagon (12-sided polygon)

  • (n-2)180°
  • (12-2)180°
  • (10)180°
  • 1800°

Formula for sum of the interior angles:

  • (n-2)180°
  • n = sides of the polygon