Perimeter
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Subject Area: Mathematics (B.E.S.T.) | Grade Level: 3
Lesson Length: 30 minutes
Keywords/Tags: Perimeter
Lesson Description: In this lesson, students will explore the identifying and finding the perimeter of shapes.

  • MA.3.GR.2.4 Solve mathematical and real-world problems involving the perimeter and area of composite figures composed of non-overlapping rectangles with whole-number side lengths.
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Video : Learning about perimeter!
Instructions: Please watch the following video as many times as needed before starting to go through other lesson pages. Understanding the content of the video is very important since the lesson activities will be all about this video content.
Description: Learn about perimeter with Annie and Moby!
Reading : Perimeter reading
Instructions: Please read the following passage as many times as needed (aloud and silent) before starting to go through the rest of the lesson pages. Understanding the content of this passage is very important since the following lesson activities will be all about this content. Feel free to print the reading if needed.

Perimeter

The perimeter of a shape is the distance around the edges. The perimeter of a shape is the sum of the length of all the sides.

Perimeter of a Polygon

A polygon is a closed shape made up of several straight-line segments. The perimeter of a polygon is the sum of the length of all these sides. For example, the perimeter of the polygon pictured below is equal to 1 + 5 + 4 + 2 + 7 = 19:

Perimeter of a Rectangle

A rectangle is a 4-sided polygon in which opposite sides have the same length and all angles have the same measure. Since opposite sides have the same length, we have only to add the lengths of two adjacent sides and multiply by 2 (so each side is "counted" twice).

Perimeter of a Square

A square is a 4-sided polygon in which all the sides are the same length. Therefore, to find the perimeter of a square, we have only to multiply one side by 4. 

Description: Please read about the different ways to find the perimeter of shapes.
Quiz : Identify perimeter
Instructions: Please complete this quiz by choosing the correct answer for each question. You can take this quiz as many times needed.
Question #1
1. Yung is roping off an area to plant a garden in her backyard. The garden needs to be 30 feet by 15 feet. How much rope will she need?
Question #2
What is the perimeter of a rectangle piece of paper with a width of 8 inches and a length of 11 inches?
Question #3
What is the perimeter of a rectangle table with a width of 4 feet and a length of 8 feet?
Question #4
Jonah's room is 11 feet long and 14 feet wide. Eli's room is 13 feet wide and 12 feet long. Whose room has a greater perimeter?
Question #5
The classroom's whiteboard is 15 feet wide and has a perimeter of 38 feet. How tall is the whiteboard?
Resources : Extra Resources
Instructions: Please see additional external resources below. Feel free visit each link to learn more about this lesson.
BrainPop Jr.
Join Annie and Moby with additional activities about perimeter!
Splashlearn
Enjoy playing review games about perimeter!
Identify the perimeter
Enjoy playing this game to identify the perimeter of shapes!
Description: Please see here for additional resources for identifying and solving the perimeter.