It is not essential that all the figurespossess a heat or present of symmetry in different figures.

You are watching: Lines of symmetry for a triangle

Figures might have:

No heat of symmetry

1, 2, 3, 4 …… lines of symmetry

Infinite lines of symmetry


Let us take into consideration a perform of examples and also findout present of the contrary in different figures:

1. Line segment:


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In the figure there is one heat of symmetry.The number is symmetric along the perpendicular bisector l.

2. An angle:


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In the figure there is one heat of symmetry.The figure is symmetric follow me the edge bisector OC.

3. An isosceles triangle:


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In the number there is one heat of symmetry.The number is symmetric follow me the bisector that the vertical angle. The typical XL.

4. Semi-circle:


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In the number there is one line of symmetry.The number is symmetric follow me the perpendicular bisector l. That the diameter XY.

5. Kite:


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In the figure there is one heat of symmetry.The number is symmetric along the diagonal line QS.

6. Isosceles trapezium:


In the number there is one line of symmetry.The figure is symmetric along the heat l joining the midpoints of two parallel sides abdominal and DC.

7.Rectangle:


In the figure there space two present ofsymmetry. The number is symmetric along the currently l and m involvement the midpoints ofopposite sides.

8. Rhombus:


In the figure there room two lines of symmetry.The number is symmetric follow me the diagonals AC and also BD of the figure.

9. It is intended triangle:


In the number there space three currently of symmetry.The figure is symmetric along the 3 medians PU, QT and also RS.

10. Square:


In the figure there are 4 lines ofsymmetry. The number is symmetric along the 2diagonals and 2 midpoints ofopposite sides.

11. Circle:


In the figure there are infinite lines ofsymmetry. The number is symmetric follow me all the diameters.

Note:

Each continuous polygon (equilateral triangle,square, rhombus, continual pentagon, consistent hexagon etc.) room symmetry.

The number of lines of symmetry in a regularpolygon is equal to the variety of sides a continual polygon has.

Some numbers like scalene triangle andparallelogram have no present of symmetry.

Lines of symmetry in letters of the English alphabet:

Letters having one line of symmetry:

A B C D E K M T U V W Y have actually one heat of symmetry.

A M T U V W Y have actually vertical heat of symmetry.

B C D E K have actually horizontal heat of symmetry.


Letter having actually both horizontal and vertical lines of symmetry:

H ns X have actually two present of symmetry.


Letter having no lines of symmetry:

F G J together N ns Q R S Z have actually neither horizontal no one vertical lines of symmetry.


Letters having infinite present of symmetry:

O has actually infinite lines of symmetry. Infinite number of lines passes through the allude symmetry around the facility O through all possible diameters.


Lines the Symmetry

● Related principles

● straight Symmetry

● point Symmetry

● Rotational the opposite

● stimulate of Rotational Symmetry

● varieties of symmetry

● Reflection

● have fun of a allude in x-axis

● have fun of a allude in y-axis

● have fun of a allude in beginning

● Rotation

● 90 level Clockwise Rotation

● 90 level Anticlockwise Rotation

● 180 degree Rotation

7th Grade mathematics Problems8th Grade math PracticeFrom currently of the opposite to house PAGE


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