Math unit36 contructions and enlargements
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This document discusses geometric transformations including lines of symmetry, rotational symmetry, enlargements, and finding the scale factor and center of enlargement. Lines of symmetry and orders of rotational symmetry are identified for different shapes. Enlargements are performed using given scale factors and centers. The ratio of areas for different enlargements is calculated. Scale factors and centers of enlargement are determined for shapes.
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Math unit36 contructions and enlargements
- 1. 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
- 2. Unit 36 36.1 Lines of Symmetry
- 3. Draw on each diagram all its lines of symmetry
- 4. Complete the diagrams so that each shape has only the lines of symmetry shown by the dotted line
- 5. Unit 36 36.3 Order of Rotational Symmetry
- 6. What is the order of rotational symmetry? 2 3 1 or none 2 ? ? ? ?
- 7. Complete the diagrams below so that they have the given rotational symmetry about the point. Order 2 Order 4 Order 4 Order 3
- 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??
- 10. Unit 36 36.4 Finding the Scale Factor and Centre of Enlargement
- 11. For each of the shapes give the scale factor and mark the centre of enlargement. (a) 2 (b) 2 (c) 1.5 (d) 2.5?? ??