2.6 heat symmetry

Look at the shapes below. The the contrary of the shape on the left and its connection to the form on the right deserve to be thought of in 2 ways:

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

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Imagine a mirror put along the central dotted line. The reflection in the mirror offers the other fifty percent of the shape.


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

The following all have actually line symmetry:


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A shape have the right to have much more than one line of symmetry. For this reason a rectangle has actually two currently of symmetry, an equilateral triangle has three lines of symmetry, and a square has four.


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A circle has actually an infinite number of lines that symmetry because it deserve to be folded around any diameter. Just eight of the possible lines of the contrary are indicated below.


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Some shapes, such together a scalene triangle, have actually no lines of the opposite – the is not feasible to wrinkles the shape about a heat so that the 2 halves fit specifically on height of one another.


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