1. Similar shapes L.O. Calculate unknown sides in similar triangles

2. Two shapes are said to be similar if one can be obtained from the other by uniformly scaling, possibly with additional translation, rotation or reflection.

3. Are these triangles similar? 3 cm 4 cm 5 cm 6 cm 10 cm 8 cm A B If the shapes are similar what can you tell about the angles in the shapes? IDENTIFY SIMILAR SHAPES

4. Are the shapes similar? 2 cm 6 cm If the shapes are similar what can you tell about the angles in the shapes? 6 cm BA IDENTIFY SIMILAR SHAPES

5. Are the shapes similar? 6 cm 10 cm 2 cm 4 cm B A If the shapes are similar what can you tell about the angles in the shapes? IDENTIFY SIMILAR SHAPES

6. Are the shapes similar? 5 cm 10 cm2 cm 4 cm B A If the shapes are similar what can you tell about the angles in the shapes? IDENTIFY SIMILAR SHAPES

7. Are these triangles similar? 3 cm 4 cm 5 cm 12 cm 15 cm 9 cm A B IDENTIFY SIMILAR SHAPES If the shapes are similar what can you tell about the angles in the shapes?

8. Calculating unknown sides 3 cm 15 cm 7 cm X cm

9. Calculating unknown sides X cm Y cm

10. Calculating unknown sides 5 cm 8 cm Y cm 9 cm X cm 34.2 cm

11. STAR Time

17. Which pair are similar? STAR Time

21. GCSE A Grade Question!

22. Plenary Write a key word from today’s lesson on your whiteboard

23. Plenary 5 cm 8 cm Y cm 15 cm X cm 36 cm Find X and Y Show your method clearly