Lesson Plan: Perimeter of Polygons Mathematics • 3rd Grade
This lesson plan includes the objectives, prerequisites, and exclusions of the lesson teaching students how to find the perimeter of a polygon by adding the lengths of its sides.
Objectives
Students will be able to
- measure side lengths to find the perimeter of polygons,
- use addition to find the perimeter of polygons whose side lengths are given,
- use attributes of common polygons like squares, rectangles, and equilateral triangles to find the perimeter when not all side lengths are given,
- find missing side lengths in polygons given the perimeter.
Prerequisites
Students should already be familiar with
- measuring length in standard units,
- the definition of perimeter,
- how to find the perimeter by counting unit segments.
Exclusions
Students will not cover
- learning the formula for the perimeter of squares and rectangles,
- unit conversions,
- the term regular polygon.
