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Classification of Polygons

This topic explains the classification of polygons and quadrilaterals. Finding the measures of angles in polygons is also covered in this topic.

Topic: Angle Measures in Polygons

  • A polygon is a closed plane figure formed by three or more segments. A polygon is named by the number of its sides

  • Find the sum of the angle measures in a polygon by dividing the polygon into triangles

  • The angle measures of a triangle add up to 180° (Triangle Sum Theorem)

  • An n-gon can be divided into n - 2 triangles. The sum of the angle measures of any n-gon is 180° (n - 2)

  • If all sides and angles of a polygon are congruent, the polygon is known as a regular polygon

Topic: Classify Quadrilaterals

  • A polygon is a closed plane figure formed by three or more segments. A polygon is named by the number of its sides

  • A trapezoid has exactly 1 pair of parallel sides and a parallelogram has 2 pairs of parallel sides

  • A rectangle has 4 right angles

  • A rhombus has 4 congruent sides

  • A square has 4 congruent sides and 4 right angles
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