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
