Rectangle abcd is similar to rectangle rstu. What is the scale factor of a dilation from abcd to rstu ? enter your answer as a decimal in the box. Two rectangles a b c d and s t r u. In rectangle a b c d, side d c is the base. Side a d is labeled 50 feet and side d c is labeled 90 feet. In rectangle s t r u, side t s is the base. Side u t is labeled 45 feet and side u r is labeled 25 feet.