The video tutorial introduces the concept of similar figures, explaining that they are figures that are enlargements or reductions of each other without distortion. It discusses the conditions for polygons to be similar, such as having equal corresponding angles and proportional corresponding sides. The tutorial provides examples using pentagons and demonstrates how to calculate similarity ratios and solve for unknown lengths using cross-multiplication. It also applies these concepts to real-life scenarios, such as determining the height of a tree using a yardstick and its shadow.

What is a key characteristic of similar figures?

• They have different shapes and different sizes.

• They have the same size.

• They have the same shape but different sizes.

• They have different shapes but the same size.

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CCSS.8.G.A.2

CCSS.HSG.CO.B.6

For two polygons to be considered similar, what must be true about their corresponding angles?

• They must be complementary.

• They must be supplementary.

• They must be right angles.

• They must have the same measurement.

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CCSS.8.G.A.2

CCSS.HSG.CO.B.6

What is the similarity ratio of two similar figures if one side of the first figure is 8 cm and the corresponding side of the second figure is 10 cm?

• 8 to 10

• 10 to 8

• 5 to 4

• 4 to 5

If the similarity ratio of figure A to figure B is 4 to 5, what is the similarity ratio of figure B to figure A?

• 10 to 8

• 8 to 10

• 5 to 4

• 4 to 5

Given that side IG is 8 cm and side OW is 10 cm, what is the length of side GH if side WE is 8 cm?

• 8.0 cm

• 7.2 cm

• 9.0 cm

• 6.4 cm

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CCSS.HSG.CO.C.10

If side NI is 7.2 cm and side PO is n + 2 cm, what is the value of n given the similarity ratio is 8 to 10?

• 8

• 5

• 6

• 7

What is the length of side PO if n is found to be 7?

• 10 cm

• 9 cm

• 8 cm

• 7 cm

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CCSS.HSG.CO.C.11

If a yardstick's shadow is 4 feet long and a tree's shadow is 24 feet long, what is the height of the tree?

• 22 feet

• 20 feet

• 18 feet

• 16 feet

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CCSS.8.G.A.2

CCSS.HSG.CO.B.6

What is the ratio of the yardstick's shadow to the tree's shadow?

• 1/6

• 1/5

• 1/7

• 1/4

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CCSS.7.G.A.1

Why is understanding similar figures useful in real life?

• For measuring distances accurately.

• For making scale models before large projects.

• For understanding geometric shapes.

• For solving algebraic equations.

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CCSS.8.G.A.2

CCSS.HSG.CO.B.6