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Two rectangles are similar if and only if their corresponding sides are in proportion.

If 4/5 = 10/8, then (4)(8) = (5)(10), because in any proportion the product of the means equals the product of extremes. Since 32≠ 50, the corresponding sides of those rectangles are not in proportion, so that rectangles are not similar.

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Q: Is a 4X10 rectangle similar to a 5X8?
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