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A rectangle has length 2x and width x. If each diagonal of the rectangle has length d, what is the area of the rectangle, in terms of d?
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A.$$\frac{2}{5}d$$
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B.$$\frac{5}{2}d$$
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C.$$\frac{4}{25}d^{2}$$
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D.$$\frac{2}{5}d^{2}$$
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E.$$\frac{2}{3}d^{2}$$
D显示答案
