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Congruent Triangles Exploration 3

Drag any points on triangle ABC and check what happens to triangle DFE. You also coincide triangle DFE with triangle ABC and see if they fit with each other.

Given the two triangles above, what combination of parts of the triangles are highlighted and compared?

In the diagram above, looking at one of the triangles, is the angle in between the two highlighted sides, yes or no?

Would it always be true that the two triangles compared are proven to be congruent by just using the combination Side-Angle-Side (SAS)?