2.6 line symmetry

Look in ~ the shapes below. The symmetry of the shape on the left and its partnership to the shape on the right deserve to be thought of in two ways:

Fold the left-hand shape along the central line. Climate one side lies precisely on height of the other, and also gives the form on the right.

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Imagine a mirror put along the main dotted line. The reflection in the mirror gives the other half of the shape.


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The dashed lines stand for lines the symmetry, and also each form is said to it is in symmetrical around this line.

The following all have actually line symmetry:


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A shape can have more than one line of symmetry. Therefore a rectangle has two lines of symmetry, an it is intended triangle has actually three present of symmetry, and also a square has four.


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A circle has actually an infinite variety of lines the symmetry because it can be folded around any diameter. Only eight that the possible lines of the opposite are indicated below.


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Some shapes, such together a scalene triangle, have actually no currently of symmetry – that is not feasible to fold the shape around a heat so that the two halves fit precisely on height of one another.


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