We can convert this property to this triangle.
If 72/90 = 54/67.5, TU || RS.
So, is the equation true?
72/90 = 54/67.590/67.5 = 4/3
54(4/3)/67.5(4/3) = 72/9072/90 = 72/90
The equation is true, so TU || RS.
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