Circle O has a radius of 8. Circle P has a radius of 3. The length of the common external tangent is 12. Find the distance between the center of the two circles.

answer: the area of the parallelogram below is 42 square meters.

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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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