5. Proving Triangle Congruence by SSS
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Their are two types of statements, one telling us a couple of sides are perpendicular, and another telling us that four segments are congruent.
The first two statements tell us the sides LM and MN are perpendicular as are ST and TU.
We also know that LM≅ MN≅ UT≅ ST which tells us that both legs of both triangles are all congruent to each other. Let's mark this as well.