I was wondering what the formula is for finding the length of the black line in the attached image.

Mathematics For Machine Technology
8th Edition
ISBN:9781337798310
Author:Peterson, John.
Publisher:Peterson, John.
Chapter20: Ratio And Propor Tion
Section: Chapter Questions
Problem 43A: The proportion AB=CDcompares the sides of two triangles like those in Figure 209. Determine the...
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I was wondering what the formula is for finding the length of the black line in the attached image. 

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