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**10-8 Areas and Volumes of Similar Solids**

Theorem 10-12 Similar Solids Similarity Ratio

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**Vocabulary Similar Solids Similarity Ratio**

If similar solids have the same shape, all of their corresponding shapes are proportional. The ratio of corresponding linear dimensions of two similar solids.

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**#1 Identifying Similar Solids**

Are the two cylinders similar? If so, give the similarity ratio. 6 5 12 10

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**Theorem 10-12 Areas and Volumes of Similar Solids**

If the similarity ratio of two similar solids is a:b, then the ratio of their corresponding areas is a2:b2, and the ratio of their volumes is a3:b3

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**#2 Finding the Similarity Ratio**

Find the similarity ratio of two similar prisms with surface areas 144 m2 and 324 m2.

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**#3 Using a Similarity Ratio**

The volume of two similar solids are 128 m3 and 250 m3. The surface area of the larger solid is 250 m2. What is the surface area of the smaller solid?

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**#4 Using a Similarity Ratio**

Two similar square pyramids have volumes of 48 cm3 and 162 cm3. The surface area of the larger pyramid is 135 cm2. Find the surface area of the smaller pyramid.

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