Since these two triangles are similar, their corresponding sides are similar. If you cross multiply these ratios, you will have a product of two sides (that aren't corresponding) but that are equal.
Fill in the side length that goes where the question mark is.
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Below are two different versions of triangles ABC and AXY. Only one of the pairs is similar. Set up a similarity ratio then use the product rule to determine which one contains the similar pair.
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Practice Problem: Set up a similarity ratio then cross multiply to see if the products are equal. If they are, you have a pair of similar triangles. Answer
