### Linear
Symmetry

### Students should be able to:

- identify and describe line symmetry in two-dimensional shapes and
designs.

### Introduction to Linear Symmetry: The Letter A

Take a look at the letter below--half of it is missing. See if you can
guess what letter it is and then click the button below it to see if you
were correct.

Use this mini-movie on your SMARTBoard
### What did you notice?

After you clicked the button the right half of the letter A appeared.
**It looked exactly the same as the left half!** Because the two
sides of the A look the same, or mirror each other, we say that the
A has **line symmetry.** We call it line symmetry because we can
actually draw a line down the middle of the A that divides the letter
into two mirror images.

That line is called the **line of symmetry.** We could also fold
the A on the line of symmetry and the two halves would fit perfectly
on top of each other!

### Another Letter with Line Symmetry

Many letters have more than one line of symmetry. The letter below has
two lines of symmetry. See if you can guess what letter it is and then
click on the button. It will show you two lines of symmetry.

Use this mini-movie on your SMARTBoard