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Lesson: Perimeter of Polygons Mathematics • 3rd Grade

In this lesson, we will learn how to measure the lengths of shapes and add to find their perimeter.

Lesson Plan

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.

Q1:

Find the perimeter of this quadrilateral.

Q2:

Find the perimeter of this quadrilateral.

Q3:

Find the perimeter of the figure.