Final answer:
The question lacks sufficient context to provide an accurate answer. Additional information or a complete problem statement is needed to determine the lengths of CD and EF and whether they are equal.
Step-by-step explanation:
The question appears to be incomplete as it lacks context to provide a confident response. For example, it may be asking to find the lengths of CD and EF in a geometric figure and determine if they are equal. However, without more context or a clear description of CD and EF or the associated figure, it's not possible to accurately complete the question. In mathematics, when we compare lengths, areas, volumes, or any other measurement, we need specific information about the situation or problem we are solving. If the student is able to provide the complete problem or additional details, we could then proceed with an arithmetic or geometric approach to solve for CD and EF. It appears that the question could be related to understanding geometric properties or applying algebraic methods to find unknown values and determine equality.