# Two-Dimensional Shapes: Part 3

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

## Geometry

subject
Math
learning style
Auditory, Kinesthetic, Visual
personality style
Beaver
Primary (K-2)
Lesson Type
Quick Query

## Lesson Plan - Get It!

Audio:

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?

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!

• 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!