20
What is the perimeter of this rectangle?
(x, y2)
(x21 V 2)
(x, y)
(X218)

in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

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the bolded word " farsighted" could be replaced with visionary.

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