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KatieMO
This makes no sense at all. How can the sides of the same triangle be different lenghts?
U is the midpoint of RS. So, US is congruent to RU if RU=12 then US=12. RS=US+RU now you just substitute RS=12+12=24
oohhh, ok. So then, the other side doesn't matter. and it's a different length?
Yes, you have different types of triangles. Scalene is one, which has no sides congruent.