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Course: Mathematics — Second Preparatory
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Curriculum

Mathematics — Second Preparatory

Unit 1: Real Numbers

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Unit 2: Algebra

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Unit 3: Geometry

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Unit 4: Statistics

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Text lesson

Interior and Exterior Angles of a Polygon

Mathematics — Second Preparatory

Interior and Exterior Angles of a Polygon

Lesson summary

Lesson summary

  • The sum of the interior angles of a polygon with n sides = (n − 2) × 180°.
  • The sum of the exterior angles of any polygon = 360°.
  • In a regular polygon exterior angle = 360° ÷ n, and interior angle = 180° − exterior angle.
  • An exterior angle of a triangle equals the sum of the two opposite interior angles.
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