triangle a′b′c′ is a dilation of triangle abc .

what is the scale factor?

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triangle abc is shown. side ab is labeled 9. side bc is labeled 9. side ca is labeled 18. triangle a prime b prime c prime is shown. side a prime b prime is labeled 4 and a half. side b prime c prime is labeled 4 and a half. side c prime a prime is labeled 9.