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## JSS1: MATHEMATICS - 2ND TERM

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Lesson 6, Topic 5
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# Line of Symmetry

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### What is Line of Symmetry?

The line which divides the figure into two equal parts is called the line of symmetry or axis of symmetry.

When the exact mirror image or reflection of a line, object or shape gets created, we say there is symmetry.

The line of symmetry can be defined as the axis or imaginary line that passes through the centre of the shape or object and divides it into identical halves.

Shapes or figures may have horizontal, vertical, both horizontal and vertical, infinite and no line of symmetry.

Some examples are shown below;

An Isosceles triangle has two sides equal and two angles equal with one line of symmetry.

A kite has only one line of symmetry.

A Rectangle has opposite sides equal and all the angles 90° with two lines of symmetry.

An Equilateral triangle has all three sides equal and all three angles equal with three lines of symmetry.

A Square have all four sides equal and all angles 90° with four lines of symmetry.

A Parallelogram has opposite sides equal and parallel sides equal showing no line of symmetry. They have no line of symmetry because it is impossible to draw a line through the centre of any parallelogram that divides the figure into two equal halves that are mirror images of each other.

A Circle has infinite lines of symmetry.

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