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Answer:
UR = 20
Explanation:
Lets put UR as x. We know 2*x = 40, so x = 20.
80 units
When a figure is dilated by 2, its side measurements are halved. The figure you're seeing shows the quadrilateral after dilation (we can tell by the apostrophes); if U'R' is 40, UR will have to be 80.