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Geometry 18 Online
OpenStudy (anonymous):

Under a dilation, triangle XYZ where X(1, 3), Y(-2, -4), and Z(5, -2.5) becomes triangle X’Y’Z’ where X’(2.5, 7.5), Y’(-5, -10), and Z’(12.5, -6.25). What is the scale factor for this dilation? A. 2/5 B. -2/5 C. 2.5 D. -2.5

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