Unit 36 Constructions and Enlargements

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Presentation transcript:

Unit 36 Constructions and Enlargements Presentation 1 Lines of Symmetry Presentation 2 Order of Rotational Symmetry Presentation 3 Enlargements Presentation 4 Finding the Scale Factor and Centre of Enlargement

Unit 36 36.1 Lines of Symmetry

Draw on each diagram all its lines of symmetry

Complete the diagrams so that each shape has only the lines of symmetry shown by the dotted line

36.3 Order of Rotational Symmetry Unit 36 36.3 Order of Rotational Symmetry

What is the order of rotational symmetry? 2 ? ? 2 3 1 or none ? ?

Complete the diagrams below so that they have the given rotational symmetry about the point. Order 4 Order 2 Order 3 Order 4

Unit 36 36.3 Enlargements

What is the ratio of the areas in each case? (a) 4 (b) 9 Enlarge this shape using the given centre of enlargement and scale factors: (a) 2 (b) 3 What is the ratio of the areas in each case? (a) 4 (b) 9 ? ?

36.4 Finding the Scale Factor and Centre of Enlargement Unit 36 36.4 Finding the Scale Factor and Centre of Enlargement

For each of the shapes give the scale factor and mark the centre of enlargement. 2 1.5 2.5 ? ? ? ?