**Important Concepts and Formulas**

1. If a symmetrical object (shape) is
folded along the line of symmetry, both parts overlap each other exactly.

2. Some of the capital letters of the
English alphabet are symmetrical such as A, B, C, D, E, H, I, M, O, T, U, V, W,
X.

3. A regular polygon has as many lines
of symmetry as the number of its sides. For example, equilateral triangle–3,
square–4, pentagon–5 and hexagon–6, etc.

4. Non-symmetrical shapes are called
asymmetrical shapes.

5. A figure may have more than one line
of symmetry.

6. The concept of symmetry can be
horizontal, vertical or slanting.

7. Line of symmetry is very closely
related to mirror reflection.

8. Images are as far behind the mirror
line as the objects (shapes) are in the front.

To see more shapes with lines of symmetry ------ Click Here!