Pearson Geometry Common Core, 2011
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Pearson Geometry Common Core, 2011 View details
2. Similar Polygons
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Exercise 4 Page 444

We are told that the polygons are similar, and we want to find the value of for the missing side length.

Since the figures are similar, their corresponding sides are also similar. We can identify the pairs of congruent angles by matching them using the order they appear in the similarity statement.