Confused: Do you mean the white part of the eyes? Are they red and irritated? The sclera is generically referred to as the white of the eye, made of a very tough type of protein. When it becomes red,  the causes can vary; from infection, to eye pressure, to injury, dryness of the cornea, allergy, etc. While some causes may be self-limited, others could blind you.
Given that triangle CDE is translated down and to the right, forming triangle C'D'E'. Therefore, the congruency statement that is correct is Î´DCE â Î´D'C'E'.
Congruent means equal. Congruent line segments are usually indicated by drawing the same amount of little tic lines in the middle of the segments, perpendicular to the segments. Congruent segments do not need to be parallel to each other; they do not need to be perpendicular, either.