Congruence and Rigid Transformations

This from the CCSS math grade 8 geometry:

2. Understand that a two-dimensional figure is congruent to another if
the second can be obtained from the first by a sequence of rotations,
reflections, and translations; given two congruent figures, describe a
sequence that exhibits the congruence between them.

 In fact, one is enough, a rotation or a translation:

(click the pic to see it better)

 

And here is the picture with no text and without the unnecessary grid