Class 7 Maths
- The line about which a figure can be folded to have two congruent parts is called the line of symmetry of that figure.
- Polygons with equal sides and equal angles are called regular polygons. Regular polygons have more than one line of symmetry. A regular polygon has as many lines of symmetry as the number of sides in it.
- If an object looks exactly the same after a rotation, it is said that the object has a rotational symmetry.
- A complete turn is of 360°. The number of times an object looks exactly the same in a complete turn is called the order of rotational symmetry of that object. For example; the order of symmetry of a square is 4.