2.6 heat symmetry

Look at the forms below. The symmetry of the form on the left and its connection to the form on the right have the right to be believed of in 2 ways:

Fold the left-hand form along the main line. Climate one next lies exactly on top of the other, and gives the form on the right.

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Imagine a mirror put along the main dotted line. The enjoy in the mirror gives the other fifty percent of the shape.



The dashed lines stand for lines of symmetry, and also each shape is claimed to be symmetrical around this line.

The following all have line symmetry:


A shape can have an ext than one line of symmetry. For this reason a rectangle has two present of symmetry, an equilateral triangle has actually three currently of symmetry, and also a square has actually four.


A circle has actually an infinite number of lines of symmetry due to the fact that it have the right to be folded about any diameter. Only eight the the feasible lines of symmetry are suggested below.


Some shapes, such together a scalene triangle, have no present of symmetry – that is not possible to fold the shape about a line so that the 2 halves fit exactly on top of one another.

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