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Mathematics 15 Online
OpenStudy (anonymous):

In the figure, ΔABC is congruent to ΔADC. If the square ABCD is dilated by a factor of 2 to form A'B'C'D', what is the ratio of the area of A'B'C'D' to the area of ABCD? A. 2 : 1 B. 3 : 1 C. 4 : 1 D.5 : 1

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