1. **Does the object resemble an open book?**
   - **Answer:** No
   - **Reasoning:** The object appears to be a single solid piece with a uniform thickness and a consistent color scheme across its surfaces. It does not have distinct pages or a spine like an open book would typically have.

2. **Are there two rectangular shapes forming an obtuse angle?**
   - **Answer:** Yes
   - **Reasoning:** The images show that the object consists of two rectangular planes joined together, forming an angle greater than 90 degrees but less than 180 degrees, which classifies as an obtuse angle.

3. **Is there only one edge where the two rectangles connect?**
   - **Answer:** Yes
   - **Reasoning:** From the images provided, it is evident that the two rectangular sections of the object meet along a single, continuous edge, indicating that there is only one edge where the two rectangles connect.

4. **Is the sketch extruded to give the object a 3D appearance?**
   - **Answer:** Yes
   - **Reasoning:** The object displays thickness and three-dimensional form, suggesting that the original 2D sketch or design of the object was extruded to create a 3D model. This is evident from the shadows and the visible depth in the images.