SYMMETRY: Overview of Learning Intentions
EARLY LEVEL Symmetry is a mirror image. Symmetrical pictures are created by folding (e.g. paint half a butterfly and fold to complete the picture). When we create symmetrical pictures we must ensure that both halves are the same. We can create symmetrical patterns using a range of media (eg tiles).
FIRST LEVEL There are many examples of symmetry in a child’s environment (eg drawing of a face). There are many examples of symmetry in the wider environment (eg road signs, brand logos). There are many shapes which exhibit symmetry (eg rectangle). Symmetrical pictures/patterns can be made using a wide range of media (eg tiles, straws) Drawings are symmetrical if one half is a mirror image of the other. A line of symmetry cuts an image in half. Some patterns, pictures and shapes have more than one line of symmetry.
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There are lines of symmetry all Rotational symmetry occurs in the around us (eg in some letters of the environment (eg petals on flowers). alphabet). A shape, picture or pattern has There are lines of symmetry in the rotational symmetry if it remains wider environment (eg 4 lines of unchanged when it is turned less symmetry on a square). than 360 degrees about a fixed point. There are lines of symmetry in some of the following 2D shapes: • quadrilaterals • triangles • polygons Unfinished patterns are completed by using the lines of symmetry to create exact reflections of the original part. Unfinished pictures are completed by using the lines of symmetry to create exact reflections of the original part.
A shape has half-turn symmetry if it fits in its outline two ways (similarly for third-turn, quarter-turn etc). The order of a shape is the number of ways it fits in its outline. A design with rotational symmetry must fit in its outline more than once.