You may be knowing well about the term symmetry which is defined as a balanced and a proportionate similarity which is found in two halves of an object, that is, one-half is the mirror image of the other half. Let us now learn about the line of symmetry.
Line of Symmetry
The imaginary line or axis along which you can fold a figure to obtain the symmetrical halves is called the line of symmetry. It basically divides an object into two halves. There may be one or more lines of symmetry. In fact, a shape may have:
- No line of symmetry which implies that the figure is asymmetrical
- Infinite lines of symmetry
- One line of symmetry
- Two lines of symmetry
- Multiple (more than two) lines of symmetry
Check the symmetry article to learn more about no line of symmetry, infinite lines of symmetry, 1 and 2 lines of symmetry in detail. Here, let’s focus on shapes with multiple lines of symmetry.
Multiple Lines of Symmetry
The lines or axes may be any combination of vertical, horizontal and diagonal.
Three Lines of Symmetry:
An equilateral triangle has about three lines of symmetry. It is symmetrical along its three medians.
Some other patterns also have three lines of symmetry.
Four Lines of Symmetry:
A square is symmetrical along four lines of symmetry, two along the diagonals and two along with the midpoints of the opposite sides.
Some other patterns also have four lines of symmetry.
Five Lines of Symmetry:
A regular pentagon has around five lines of symmetry. The lines joining a vertex to the mid-point of the opposite side divides the figure into ten symmetrical halves.
Some other patterns also have five lines of symmetry, such as a star.
Six Lines of Symmetry:
A regular hexagon is said to have six lines of symmetry, 3 joining the opposite vertices and 3 joining the mid-points of the opposite sides.
Similarly, a regular polygon with N sides has N lines of symmetry.
Infinite Lines of Symmetry:
A circle has infinite or no lines of symmetry. It is symmetrical along all its diameters.
Also Check: Reflection Symmetry
Line of Symmetry – Examples
Some of the examples of line of symmetry for different figures are given below-
- A Triangle is said to have 3, 1 or even no lines of symmetry
- A Quadrilateral has 4 or 2 or no lines of symmetry
- Equilateral Triangle is said to have 3- lines of symmetry
- Regular Pentagon has 5 lines of symmetry
- A Regular Heptagon has 7 lines of symmetry
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