● The line that divides any figure into two equal halves such that each half exactly coincides with the other is known as the line of symmetry or axis of symmetry.
● A shape has reflection symmetry if it has a line of symmetry.
● An object is said to have a rotational symmetry if it looks the same after being rotated about its centre through an angle less than 360°.
● The total number of times a figure coincides with itself in one complete rotation is called the order of rotational symmetry.
● Translation symmetry occurs when an object slides to a new position. The sliding movement involves neither rotation nor reflection.