Final answer:
To confirm M is the midpoint of DC, we check for equal lengths of DM and MC and use the congruence notation ℝDM ≅ ℝMC.
Step-by-step explanation:
To determine that M is the midpoint of segment DC, we need to identify that M divides DC into two segments of equal length. If we have a geometric figure or a given set of instructions indicating that DM is equal to MC, then we can conclude that M is indeed the midpoint. In terms of notation, the congruent segments would be written as ℝDM ≅ ℝMC, where the symbol '≅' represents geometric congruence, meaning that the segments have the same length and are therefore congruent.