Lesson Plan: Similar Polygons | Nagwa Lesson Plan: Similar Polygons | Nagwa

Lesson Plan: Similar Polygons Mathematics • 8th Grade

This lesson plan includes the objectives, prerequisites, and exclusions of the lesson teaching students how to use the properties of similar polygons to find unknown angles, side lengths, scale factors, and perimeters.


Students will be able to

  • recognize that if two polygons are similar, then they contain angles of equal measure and corresponding sides that are in proportion,
  • use proportionality of sides to prove similarity,
  • use similarity to calculate unknown angle measures, scale factors, unknown side lengths, and perimeters,
  • use similarity of polygons to solve real-world problems.


Students should already be familiar with

  • ratios,
  • finding a missing interior angle of a polygon using the sum of the angles of the polygon.


Students will not cover

  • similarity problems involving area or volume,
  • similarity with equations.

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