Big Ideas Math: Modeling Real Life, Grade 8
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Big Ideas Math: Modeling Real Life, Grade 8 View details
4. Surface Areas and Volumes of Similar Solids
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Exercise 9 Page 450

Similar solids are solids that have the same shape and proportional corresponding dimensions.

Yes

Practice makes perfect
We are given the diagram of two pyramids, where we can see their dimensions.
Two similar square pyramids, where the first one has the square base with the side length of 5 feet, the height of 6 feet and the slant height of 6.5 feet and the second pyramid has the square base with the side length of 10 feet, the height of 12 feet, and the slant height of 13 feet

We want to know if these two solids are similar. Similar solids have the same shape and proportional corresponding dimensions. Therefore, to determine whether the cones are similar, we will calculate the ratio between corresponding lengths.

Ratio Substitute Simplify
Length of base of the bigger pyramid/Length of base of the smaller pyramid 10/5 2
Width of base of the bigger pyramid/Width of base of the smaller pyramid 10/5 2
Height of the bigger pyramid/Height of the smaller pyramid 12/6 2
Slant height of the bigger pyramid/Slant height of the smaller pyramid 13/6.5 2

The ratio between corresponding lengths is 2. Therefore, the pyramids are similar.