RS Aggarwal Solutions for Class 7 Chapter 18 Reflection and Rotational Symmetry, Reflection in mathematics represents flip of a figure in a point, whereas rotation is a motion. Reflection and Rotational”, a reflection is the flipping of a point or figure over a line of reflection (the mirror line). A rotation is the turning of a figure or object around a fixed point: reflection and Rotational Symmetry. A figure is said to be symmetrical about a line l if it is identical on either side of l. In this case, l is called the line or axis of symmetry. A figure is said to have rotational symmetry if it fits onto itself more than once during a complete rotation. A circle is thus said to be symmetric under rotation or to have rotational symmetry. If the isometry is a reflection of a plane figure about a line, then the figure is said to have reflectional symmetry or line symmetry. It is also possible for a figure/object to have more than one line of symmetry. Topics covered in this chapter are reflection symmetry, rotational symmetry and figures having line symmetry and rotational symmetry.