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Published byGwendolyn Doyle Modified about 1 year ago

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Transformations Moving a shape or object according to prescribed rules to a new position. USE the tracing paper provided to help you understand in the exam.

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Reflection Rotation Translation Combined Transformations Enlargement (A later presentation)

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The shape (A) is reflected in a mirror line so that the new position (shape B) is the same distance from the mirror line but the shape is reversed (mirror image). Distances from any point to the line are identical. Reflection Mirror line AB

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X axis reflection Axis reflections Y axis reflection Reflection in line x = 2 x = 2 Reflection in line y = –1 y = –1

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Reflection on the line y = x Think about where the line would be! Measure from the original to the mirror line and then extend to the other side.

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Rotation The shape is rotated about a given centre by a given angle and stating whether clockwise or anticlockwise. B A A B = 90 O clockwise about the origin (0,0) A

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Rotation The shape is rotated about a given centre by a given angle and stating whether clockwise or anticlockwise. C A A C = 180 O clockwise about the origin (0,0) A

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Translation A B y x The “vector” given is written in a large bracket as shown below This means move the shape in both the ‘x’ and ‘y’ direction. Given as a vector The translation from A to B is given by i.e. 1 across and 6 down

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Combined Transformations Two or more transformations may combine to give ‘something different’. In this case two reflections of ‘A’ can be shown to be a rotation to produce ‘C’ A BC

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Combined Transformations 2 Reflections = 2 Rotations = Reflection + Rotation (90) 3 c/w Reflections = This is particularly useful to remember for the exam!! 1 Rotation (180) 1 Rotation (add the angles) = Rotation (180) 1 Reflection (anti-c/w)

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