Exploring Proportions in Similar Triangles

This video tutorial covers solving similar triangles using proportions. It explains how to find missing side lengths and angles by setting up and solving proportions. The tutorial includes several example problems, demonstrating the process of cross-multiplication and division to find unknown values. It also addresses how to handle rotated triangles and emphasizes the congruence of angles in similar figures. The video concludes with a final problem and a summary of the key concepts.

What property do similar triangles' sides have?

• The sides are congruent.

• The sides are perpendicular.

• The sides are proportional.

• The sides are parallel.

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CCSS.HSG.SRT.A.2

How do you solve for a missing side length in similar triangles?

• Multiplying the known lengths

• Setting up and solving proportions

• Dividing the known lengths

• Subtracting the known lengths

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CCSS.HSG.SRT.A.2

What is the value of EF in the first example?

• 9

• 24

• 34.2

• 2.25

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CCSS.8.G.B.8

What operation is primarily used to solve for missing sides in similar triangles?

• Cross multiplication

• Addition

• Subtraction

• Multiplication

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CCSS.HSG.SRT.B.5

In the second example, what is the length of EF?

• 24

• 9

• 34.2

• 2.25

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CCSS.8.G.B.8

What is the length of AC in the second example?

• 24

• 9

• 2.25

• 34.2

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CCSS.8.G.B.8

How are angles in similar triangles related?

• They are congruent.

• They are supplementary.

• They are complementary.

• They are proportional.

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CCSS.HSG.SRT.A.2

What is the value of angle B in the third example?

• 70 degrees

• 105 degrees

• 34.2 degrees

• 21 degrees

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CCSS.8.G.A.5

What is the length of the side marked Y in the last example?

• 34.2

• 24

• 9

• 2.25

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CCSS.8.G.B.8

What are the values of angles E and F in the last example?

• 21 degrees

• 70 degrees

• 105 degrees

• 34.2 degrees

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CCSS.HSG.CO.C.9