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How do i find the missing angle measure in a polygon

Quadrilateral efgh was dilated with the origin as the center of dilation to create quadrilateral e'f'g'h'. the quadrilateral was dilated using a scale factor of 2.5. the lengths of the sides of quadrilateral efgh are given. what is the length of side f'g'?

Keith runs 5 miles in 38 minutes. at the same rate, how many miles would he run in 57 minutes