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Objectives: Find co-ordinates of points determined by geometric information. Understand and use the language and notation of reflections. Recognise transformation and symmetry of a 2-D shape: reflection in given mirror lines and line symmetry. Vocabulary:

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0 1 1 234567891011 2 3 4 5 6 7 8 9 10 11 x y

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0 1 1 234567891011 2 3 4 5 6 7 8 9 10 11 x y

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0 1 1 2345678910 11 2 3 4 5 6 7 8 9 10 11 y x Rhombus?

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0 1 1 234567891011 2 3 4 5 6 7 8 9 10 11 x y

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0 1 1 234567891011 2 3 4 5 6 7 8 9 10 11 x y

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0 1 1 234567891011 2 3 4 5 6 7 8 9 10 11 x y

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0 1 1 234567891011 2 3 4 5 6 7 8 9 10 11 x y

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0 1 1 234567891011 2 3 4 5 6 7 8 9 10 11 x y

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Move one square only: horizontal line of symmetry

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Move one square only: Vertical line of symmetry

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Move one square only: diagonal, vertical and horizontal lines of symmetry

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Move one square only: no lines of symmetry

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Add two more squares to make the red line a line of symmetry:

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A B C D E F Which triangles are reflections of triangle A?

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A B C D E F B is a reflection of A

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A B C D E F C is not a reflection of A It is a rotation of A

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A B C D E F D is a reflection of A

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A B C D E F E is not a reflection of A. It is a translation (slide).

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A B C D E F F is a reflection of A

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A B C D E F Are any of the other triangles reflections of each other? D is reflection of E ( or vice versa)

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Thank you for your attention

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Geometry Unit 1: Transformations

Geometry Unit 1: Transformations

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