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What is the length of B'C' if ABCD is dilated by a scale factor of 4?

What is the length of B'C' if ABCD is dilated by a scale factor of 4?-example-1

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Lenght of BC = 5

Given that ABCD was dilated by a scale factor of 4, then B'C' is four times longer than BC, that is, B'C' = 4*5 = 20

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