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In the given figure, you are asking which segment is "skew" to segment \( DE \). 

**Definition of skew lines:** Two lines are said to be skew if they are not parallel and do not intersect. In 3D geometry, skew lines exist on different planes.

### Analysis of the figure:
- \( DE \) is on the front face of the solid (quadrilateral base \( ABCD \)).
- Skew lines would be lines that are neither parallel to nor on the same plane as \( DE \).

### Segments on the same plane as \( DE \):
- \( BC \), \( AB \), and \( CD \) are all part of the planes that might intersect or be parallel to \( DE \).
- \( AC \) and \( BE \) are also not skew, as they could potentially intersect or lie on the same plane as the others.

### Skew segment:
- **Segment \( AB \)** is skew to \( DE \), as it is neither parallel to \( DE \) nor intersects it. \( AB \) and \( DE \) lie on different planes.

Would you like further clarification or additional details on this problem? 

Here are some related questions:
1. What are the properties of skew lines in 3D geometry?
2. How can we determine if two lines are parallel or skew?
3. How do planes affect the relationships between segments?
4. Can two skew lines be perpendicular?
5. How does the projection of skew lines differ on a 2D plane?

**Tip:** When analyzing skew lines, always ensure that the lines lie on different planes and neither intersect nor are parallel.

In this geometry problem, learn how to identify skew lines in a 3D figure. The query asks which segment is skew to DE, involving concepts of 3D geometry and the definition of skew lines. Suitable for students in Grades 8-10.

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