Lesson Plan: Polygons and Nonpolygons | Nagwa Lesson Plan: Polygons and Nonpolygons | Nagwa

Lesson Plan: Polygons and Nonpolygons Mathematics

This lesson plan includes the objectives, prerequisites, and exclusions of the lesson teaching students how to define and identify polygons and nonpolygons and sort two-dimensional figures into polygons and nonpolygons.


Students will be able to

  • define polygons as closed shapes made of straight-line segments,
  • recognize whether a given shape is a polygon,
  • sort shapes into polygons and nonpolygons,
  • identify attributes of polygons and nonpolygons,
  • investigate whether the number of sides and the number of vertices in any given polygon are equal.


Students should already be familiar with

  • two-dimensional shapes,
  • three-dimensional shapes,
  • the difference between a line segment and a curve,
  • the difference between closed and open shapes,
  • triangles, quadrilaterals, pentagons, and octagons,
  • the vertices and sides of a closed figure.


Students will not cover

  • naming polygons,
  • determining whether polygons are regular or irregular,
  • concave polygons,
  • congruence,
  • angles.

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