4.3 similar triangles

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4.3 Similar Triangles 1 May 20, 2014 Similarity Similar Triangles Similar Polygons Homework Page 150 #5, 6, 8, 10, 12, 18

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Page 1: 4.3 Similar Triangles

4.3 Similar Triangles

1

May 20, 2014

SimilaritySimilar Triangles

Similar Polygons

HomeworkPage 150 #5, 6, 8, 10, 12, 18

Page 2: 4.3 Similar Triangles

4.3 Similar Triangles

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May 20, 2014

Similar TrianglesWe say that two triangles are similar:

­ if their side lengths reduce to the same three­term ratio.

­ corresponding angles must also be equal.

Page 3: 4.3 Similar Triangles

4.3 Similar Triangles

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May 20, 2014

Example 1:

Note: figures are not drawn to scale.

Find the length of:

a) TW b) SW

Page 4: 4.3 Similar Triangles

4.3 Similar Triangles

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May 20, 2014

Example 2:

Find the measure of:

a) DE b) FE

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4.3 Similar Triangles

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May 20, 2014

Examples:

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4.3 Similar Triangles

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May 20, 2014

Page 7: 4.3 Similar Triangles

4.3 Similar Triangles

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May 20, 2014

Turn to page 152 in your textbook question 14.

Erin, who is 1.60 m tall, casts a shadow that is 1.25 m long.  Her shadow extends to the end of a tree's shadow when she stands 4.75 m from the tree.  What is the height of the tree?

1.6 m

4.75 m 1.25 m