1. **Does the object resemble an open book?**
   - **Answer:** Yes
   - **Reasoning:** The object consists of two rectangular panels connected along one edge, similar to how the covers of an open book would appear. The angle between the two panels and their arrangement gives the impression of an open book.

2. **Are there two rectangular shapes forming an obtuse angle?**
   - **Answer:** Yes
   - **Reasoning:** The images show two rectangular shapes that are connected in such a way that they form an angle greater than 90 degrees but less than 180 degrees, which defines an obtuse angle.

3. **Is there only one edge where the two rectangles connect?**
   - **Answer:** Yes
   - **Reasoning:** From the images provided, it is clear that the two rectangular shapes are connected along a single edge. This edge acts as the hinge or the spine, similar to that of a book.

4. **Is the sketch extruded to give the object a 3D appearance?**
   - **Answer:** Yes
   - **Reasoning:** The images depict the object with thickness, indicating that the original 2D sketch of the rectangles has been extruded to create a 3D form. This is evident from the visible depth and shadows in the images, showing that the object has a solid, three-dimensional structure.