Finding Similar Figures Through Ratios and Proportions

The video tutorial explains how to determine if two figures, specifically triangles, are similar by comparing their corresponding sides and angles. It covers the process of setting up and calculating ratios of side lengths, using cross multiplication to solve for unknowns, and verifying similarity through proportional relationships. The tutorial emphasizes the importance of equal angles and proportional sides in identifying similar figures.

What must be true for two figures to be considered similar?

• They must have the same side lengths.

• They must have the same angles and proportional sides.

• They must be the same size.

• They must be different shapes.

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CCSS.8.G.A.2

CCSS.HSG.CO.B.6

What is the first step in determining if two triangles are similar?

• Measure the angles.

• Compare the side lengths.

• Find the corresponding sides.

• Check if they are the same size.

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CCSS.8.G.A.2

CCSS.HSG.CO.B.6

How do you set up a ratio for corresponding sides of two triangles?

• By multiplying the side lengths.

• By adding the side lengths together.

• By dividing the side lengths of one triangle by the corresponding side lengths of the other triangle.

• By subtracting the side lengths.

What is the ratio of the sides BC and EF if BC is 9 and EF is 12?

• 12/9

• 9/12

• 4/3

• 3/4

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CCSS.7.G.A.1

If the sides AB and DE are 12 and 16 respectively, what is their ratio?

• 12/16

• 4/3

• 16/12

• 3/4

What method is used to solve for an unknown side in similar triangles?

• Addition

• Division

• Subtraction

• Cross multiplication

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CCSS.HSG.SRT.B.5

If BC is x and EF is 6, and AB is 8 and DE is 12, what is the value of x?

• 6

• 8

• 2

• 4

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CCSS.HSG.CO.C.10

What is the inverse operation of multiplication used to isolate x in the equation 12x = 48?

• Multiplication

• Division

• Subtraction

• Addition

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CCSS.6.EE.B.7

What should you check first if given the measurements of angles to determine similarity?

• If the sides are the same.

• If the shapes are the same.

• If the angles are the same.

• If the figures are the same size.

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CCSS.HSG.SRT.A.2

Are two triangles always similar if their angles are the same?

• Yes

• Only if they are isosceles triangles.

• No

• Only if their sides are also the same.

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CCSS.8.G.A.2

CCSS.HSG.CO.B.6