Contributor: Samantha Penna. Lesson ID: 11158

What is a polygon? Does that mean your parrot has escaped (your parent may have to explain that joke!)? Polygons are very important shapes, and you will watch and play and quiz your way to learn them!


Geometry, Plane Geometry (2D)

learning style
Auditory, Visual
personality style
Lion, Beaver
Grade Level
Primary (K-2), Intermediate (3-5)
Lesson Type
Quick Query

Lesson Plan - Get It!

  • There are many different shapes out there, but which ones are polygons?
  • How can you identify shapes that are polygons and shapes that are not?

In this lesson, you will learn how to identify polygons by playing games, watching videos, and sorting shapes!

A polygon is a two-dimensional shape.

This means all polygons are flat shapes. Look at all the shapes below. Some of these shapes are polygons and some of them are not.

  1. On a sheet of paper, make a T Chart (look at the picture below to see a T Chart).
  2. On one side of the T Chart, draw the shapes that are polygons.
  3. On the other side of the T Chart, draw all the shapes you think are not polygons.
  4. When you are finished drawing the shapes into each category, write two sentences about why you sorted the shapes the way you did. Did you sort them based on how many lines they have? Did you sort them based on size?
  5. Discuss your T Chart with a parent or teacher.
  6. When you are finished writing about how you sorted your shapes, put your list to the side for later.
Polygons Not Polygons









Let's learn how to identify polygons. So fa,r we know a polygon is a two-dimensional shape, just like all the shapes above; but, how can we tell what makes a shape a polygon? Look at the list below. This list will help you identify polygons.

Identifying Polygons

  1. Polygons are two-dimensional shapes.
  2. Polygons are only made up of straight lines.
  3. Polygons are always closed shapes.

Now that you know how to identify polygons, take out your T Chart. Create another T Chart. See if you can correctly categorize each shape as being a polygon or not. When you are finished rewriting your list, check your answers below.

Polygons: Nonagon, Triangle, Rectangle, Square, Hexagon, Rhombus, Pentagon, Trapezoid, Decagon, and Octagon

Not a Polygon: Oval and Circle

Circles and ovals are not polygons because they have curved lines. Polygons only have straight lines.

Move on to the next section to get some more practice with polygons!

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