**Reflection Symmetry**

**Reflection Symmetry** (sometimes called *Line Symmetry* or** ***Mirror Symmetry*) is easy to see, because one half is the reflection of the other half.

Here my dog "Flame" has her face made perfectly

symmetrical with a bit of photo magic.

The white line down the center is the **Line of Symmetry**

(also called the "Mirror Line")

The reflection in this lake also has symmetry, but in this case:

- the
**Line of Symmetry**runs left-to-right - it is not perfect symmetry, because the image is changed a little by the lake surface.

**Line of Symmetry**

The Line of Symmetry (also called the **Mirror Line**) can be in **any direction**.

But there are four common directions, and they are named for the line they make on the standard XY graph.

See these examples (the artwork was made using Symmetry Artist) :

**Line of Symmetry**

**Sample Artwork**

**Example Shape**

**Plane Shapes**

Not all shapes have lines of symmetry, or they may have several lines of symmetry. For example, a Triangle can have **3**, or **1** or **no** lines of symmetry:

**Equilateral Triangle**

(all sides equal,

all angles equal)

**Isosceles Triangle**

(two sides equal,

two angles equal)

**Scalene Triangle**

(no sides equal,

no angles equal)

**3** Lines of Symmetry

**1** Line of Symmetry

**No** Lines of Symmetry