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4.3 Similar Triangles
A. Identify Similar Triangles
Two triangles are similar if their corresponding angles are equal.
Notation:
∆ABC ∆EFG
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Similar triangles have porportional sides.
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1. Determine if each pair of triangles is similar. Show how you know.
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1. Determine if each pair of triangles is similar. Show how you know.
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c)
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B. Using Similar Triangles
Example 1 – Kyle is drawing triangles for a math puzzle. Use your knowledge of similar triangles to determine:
a) if the triangles are similar
b) the missing side length
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Part b can be solved using two methods:
Method 1 – Use a scale factor
Method 2 – Use a proportion
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Example 2 – Word ProblemTonya is 1.3 meters tall. She stands 7 meters in front of a tree and casts a shadow 1.8 meters long. How tall is the tree?
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You try:
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