By Jonathan Brinkerhoff

What does it mean when something has a line of symmetry? Let’s find out!

I’ll show you some shapes; some will have a line of symmetry, and some won’t. When you think you can describe what a line of symmetry is, raise your hand!

This figure has a line of symmetry.

This figure has no line of symmetry.

This figure has a line of symmetry.

This figure has no line of symmetry.

This figure has a line of symmetry.

This figure has no line of symmetry.

What do you think a line of symmetry is?

Do you see a line of symmetry?

Do you think it makes a difference where you draw the line? Let’s look at some examples!

This is a line of symmetry.

This is not a line of symmetry.

So, does it make a difference where you draw the line?

Do you think a figure can have more than one line of symmetry? Let’s see!

Yes, some figures have more than 1 line of symmetry.

How many lines of symmetry can you see?

So, what is a line of symmetry? Can a figure have more than one line of symmetry? Does it matter where you draw the line of symmetry?

You’ve learned all about lines of symmetry!

This figure has a line of symmetry.

This figure has no line of symmetry.

What do you think a line of symmetry is?