Triangle trs is rotated about point x, resulting in triangle bac. if ab = 10 ft, ac = 14 ft, and bc = 20 ft, what is rs?

As we can notice, after rotation the two triangles are congruent. This means that every angles and side of the first triangle is equal to the respecting angle and side of the other triangle. For the given problem, TR=AB, AC=RS, TS=BC and m(<RTS) = m(<ABC), m(<RST) = m(<ACB) and m(<TRS) = m(<BAC) . So as I said before to answer the question we know that RS=AC=14.