Question

This makes no sense at all. How can the sides of the same triangle be different lenghts?

Answer 1

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

Answer 2

oohhh, ok. So then, the other side doesn't matter. and it's a different length?

Answer 3

Yes, you have different types of triangles. Scalene is one, which has no sides congruent.

Answer 4

Okk. Thank you!! :)