Answer:
(b) ABC = FED
Step-by-step explanation:
The rigid motion concept implies that you move your points relative to another. That also means the naming of the objects (in this case triangles) has to be consistent.
By naming the first triangle ABC, you start by the lower-right corner of the triangle, go up then finish on the left-most point.
So, to name the other triangle in rigid-motion manner, you have to follow the same sequence... so it is F first, then E then D... so FED.
