# 2D and 3D shape: To identify regular and irregular polygons by reasoning about equal sides and angles

In this lesson, we will investigate the properties of similarities and differences between regular and irregular polygons and identify the number of sides and angles that make up different shapes.

Quiz:

# Intro quiz - Recap from previous lesson

Before we start this lesson, let’s see what you can remember from this topic. Here’s a quick quiz!

Q1.How many lines of symmetry does a rectangle have? 1/5

Q2.How many lines of symmetry does an equilateral triangle have? 2/5

Q3.How many lines of symmetry does a regular hexagon have? 3/5

Q4.How many lines of symmetry does this shape have? 4/5

Q5.How many lines of symmetry does this shape have? 5/5

Quiz:

# Intro quiz - Recap from previous lesson

Before we start this lesson, let’s see what you can remember from this topic. Here’s a quick quiz!

Q1.How many lines of symmetry does a rectangle have? 1/5

Q2.How many lines of symmetry does an equilateral triangle have? 2/5

Q3.How many lines of symmetry does a regular hexagon have? 3/5

Q4.How many lines of symmetry does this shape have? 4/5

Q5.How many lines of symmetry does this shape have? 5/5

# Video

Click on the play button to start the video. If your teacher asks you to pause the video and look at the worksheet you should:

• Click "Close Video"
• Click "Next" to view the activity

Your video will re-appear on the next page, and will stay paused in the right place.

# Worksheet

These slides will take you through some tasks for the lesson. If you need to re-play the video, click the ‘Resume Video’ icon. If you are asked to add answers to the slides, first download or print out the worksheet. Once you have finished all the tasks, click ‘Next’ below.

Quiz:

# To identify regular and irregular polygons

Exit quiz: List the letters of the shapes for which each statement is true.

Q1.There is a right angle at every vertex. 1/4

Q2.It has only one pair of parallel lines. 2/4

Q3.It is a regular shape. 3/4

Q4.It is not a polygon. 4/4

Quiz:

# To identify regular and irregular polygons

Exit quiz: List the letters of the shapes for which each statement is true.

Q1.There is a right angle at every vertex. 1/4

Q2.It has only one pair of parallel lines. 2/4

Q3.It is a regular shape. 3/4

Q4.It is not a polygon. 4/4

# Lesson summary: 2D and 3D shape: To identify regular and irregular polygons by reasoning about equal sides and angles

## Time to move!

Did you know that exercise helps your concentration and ability to learn?

For 5 mins...

Move around:
Jog

On the spot:
Chair yoga