The correct answer from each drop-down menu can be selected based on the geometrical context provided:

1. Angle DAB is equal or congruent to angle ABC:

   • "Congruent" would be the correct term, since angles are described as congruent when they have the same measure.

2. The length of CD is equal or congruent to 3 units:

   • "Equal" would be the correct term here, as it refers to the actual numerical length of the segment.

3. Segment DC is equal or congruent to segment CB:

   • "Congruent" would be the correct term, as segments are congruent if they have the same length, regardless of their specific measure.

Would you like more details on any part of this explanation? Here are five related questions to further your understanding:

1. What does it mean for two angles to be congruent?
2. How do you prove two line segments are congruent?
3. Can a line segment be both equal and congruent in different contexts?
4. What are some real-life examples of congruent angles or segments?
5. How would you describe the relationship between congruent angles and parallel lines?

Tip: In geometry, "congruent" is typically used to express that two shapes or figures have the same size and shape, while "equal" usually refers to their numerical measure or length.