# Symmetry review

CCSS Math: 4.G.A.3
Review symmetrical shapes and lines of symmetry.  Then, try some practice problems.

## Line of symmetry

A $\greenD{\text{line of symmetry}}$ is a line where we can fold the image and have both halves match exactly.
Example:
When we divide the figure with Line $\greenD{A}$, the resulting two parts are mirror images of each other:
Line $\greenD{A}$ is a line of symmetry.
Want to learn more about lines of symmetry? Check out this video.

## Symmetrical figures

Shapes are $\purpleC{\text{symmetrical}}$ if they have at least one $\greenD{\text{line of symmetry}}$ on them.
Example:
This shape is $\purpleC{\text{symmetrical}}$:
Because we can draw at least one $\greenD{\text{line of symmetry}}$ on it:
Want to learn more about symmetrical figures? Check out this video.