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

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Presentation transcript:

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

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.

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

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

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

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

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?

Calculating unknown sides 3 cm 15 cm 7 cm X cm

Calculating unknown sides X cm Y cm

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

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Which pair are similar? STAR Time

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