**Line of Symmetry**

__Definition of Line of Symmetry__

- Line of symmetry is a line that divides a figure into two congruent parts, each of which is the mirror image of the other.
- When the figure having a line of symmetry is folded along the line of symmetry, the two parts should coincide.

__Examples of Line of Symmetry__

- The dotted line shown in the figure is the Line of Symmetry.

__Solved Example on Line of Symmetry__

- Among the dotted lines in the figures, which one is a line of symmetry?

**Choices:**

A. the dotted lines in Figure 2

B. the dotted lines in Figure 3

C. the dotted lines in Figure 1

D. the dotted lines in Figure 4

**Correct Answer: A**

**Solution:**

**Step 1:** Line of Symmetry is a line that divides the figure into two parts, which are mirror images of each other.

**Step 2:** Among the choices, the dotted line through the letter M divides it into two parts, which are mirror images of each other.

**Step 3:** The lines passing through the letters L, P, and Q do not divide them into two parts that would be mirror images of each other.

**Step 4:** So, the dotted line through the letter M is a line of symmetry.

__Related Terms for Line of Symmetry__

- Congruent
- Mirror Image
- Symmetry
- Line

__Additional Links for Line of Symmetry__