*Contributor: Samantha Penna. Lesson ID: 11115*

Hexagon, heptagon, octagon . . . How many "gons" are there? You will learn five "gons" today, using an online game, a coloring sheet, and some craft stuff so you can build some more new, flat shapes!

categories

subject

Math

learning style

Auditory, Kinesthetic, Visual

personality style

Beaver

Grade Level

Primary (K-2)

Lesson Type

Quick Query

The shapes you will be learning about in this lesson are hexagons, heptagons, octagons, nonagons, and decagons.

- Can you guess which shape below is a
*nonagon*?

Read on to see if you guessed correctly!

You have learned so many shapes so far!

In the first **Related Lesson**, found in the right-hand sidebar, you learned about triangles, circles, squares, and rectangles.

In the second **Related Lesson**, you learned about trapezoids, ovals, pentagons, and rhombuses.

Look around your learning space for at least five shapes you see around the room.

The first shape you will learn about in this lesson is a *hexagon*. Click on the blue icon below to learn how to pronounce "hexagon".

A hexagon is a two-dimensional shape. Don’t forget, two-dimensional means *flat*. Look at the hexagons below.

- What do you notice about them?
- Do they share any similarities with the shapes you have learned already?

Count the sides.

- How many are there?
- Did you answer
*six*?

Fantastic!

Try drawing a hexagon in the sky with your finger. This will help you remember how many sides it has.

Sing and dance along to *The HEXAGON Song | HeidiSongs' Sing & Spell Shapes!* below:

The next shape you will learn about is called a *heptagon*. Learn to pronounce "heptagon" below.

A heptagon is a two-dimensional shape. This means it is *flat*.

- How many sides does a heptagon have?

If you said *seven*, great job!

- Does a heptagon have more or less sides than a
*hexagon*?

If you said a heptagon has more sides than a hexagon, you are correct! A heptagon has one more side than a hexagon.

Try drawing a heptagon in the sky with your finger. This will help you remember how many sides it has.

Look at the shapes below. These shapes are called *octagons*. Learn to pronounce "octagon" below.

- Doesn't octagon kind of sound like octopus?

An octopus has eight legs.

- Do you think an octagon has eight sides?

Count the sides of the octagon and tell a parent or teacher your answer.

- Did you say
*eight*sides?

Great!

An octagon has eight sides, just like an octopus has eight legs! An octagon is a flat, two-dimensional shape, just like all the other shapes you have been learning about.

- How many more sides does an octagon have than a hexagon?

Try drawing a octagon in the sky with your finger. This will help you remember how many sides it has.

Follow along with the *How to Draw an Octagon With a Square *video from eHow below and see if you can draw your very own octagon.

The shapes below are called *nonagons*. Learn to pronounce "nonagon" below.

Nonagons are two-dimensional shapes.

- What number do you think nonagon sounds similar to?

Count the sides with a parent or teacher.

- How many sides did you count?

If you answered *nine*, great job!

Nonagons have nine sides! Nonagon and nine both start with "N."

- Did you guess that the red shape in the opening picture of this lesson was a nonagon?

If you did, fantastic work!

- How many more sides does a nonagon have than an octagon?

If you answered *one* more side, you are correct! Try drawing a nonagon in the sky with your finger. This will help you remember how many sides it has.

The last shape you will learn about in this lesson is a *decagon*. Learn to pronounce "decagon" at below.

A decagon is a two-dimensional, or flat, shape just like all the other shapes you have learned about in this unit. Count the sides on the decagon.

- Did you say
*ten*sides?

Great!

- How many more sides does a decagon have than a heptagon?

If you said a decagon has *three* more sides than a heptagon, you are correct! Try drawing a decagon in the sky with your finger. This will help you remember how many sides it has.

You did a fantastic job learning all of these new two-dimensional shapes!

- Did you notice that the more shapes you learned, the more sides the shapes have?

You started learning about circles and ovals that have *no* sides, then you learned about triangles that have *three* sides, and now you have made it all the way to decagons that have *ten* sides!

Move on to the next section to learn more about hexagons, heptagons, octagons, nonagons, and decagons.

CHALLENGE QUESTION:

- Can a shape only have
*two*sides? Why or why not?

See the end of the *Got It?* section for the answer!

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