asically, a line of symmetry is a line that divides a figure into two mirror images.
The figure is mapped onto itself by a reflection in this line.
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A set of points has line symmetry if and only if there is a line, l, such that the reflection through l of each point in the set is also a point in the set. (May also be referred to as reflectional symmetry.)
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Certain figures can be mapped onto themselves by a reflection in their lines of symmetry. Some figures have one or more lines of symmetry, while other figures have no lines of symmetry.
(Remember, if you fold the figure on a line of symmetry, the folded sides coincide.)
Lines of Symmetry:
