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The image provides a problem related to geometry, specifically concerning a pyramid (hình chóp) with base \( ABCD \) being a parallelogram (hình bình hành). The task is to identify which of the following statements about the pyramid is correct. The options describe relationships between various lines, particularly parallelism between lines.

Let's break it down:

- \( S.ABCD \) refers to a pyramid with apex \( S \) and a parallelogram \( ABCD \) as the base.
- The options describe parallelism (denoted by the symbol \( \parallel \)) between different lines and planes.

### Options:

**A. \( SA \parallel (SBC) \):**  
This suggests that the edge \( SA \) is parallel to the plane formed by points \( S, B, C \).

**B. \( CD \parallel (SAD) \):**  
This suggests that the edge \( CD \) is parallel to the plane formed by points \( S, A, D \).

**C. \( AB \parallel (SCD) \):**  
This suggests that the edge \( AB \) is parallel to the plane formed by points \( S, C, D \).

**D. \( SB \parallel (ACD) \):**  
This suggests that the edge \( SB \) is parallel to the plane formed by points \( A, C, D \).

### Solution Process:
In a pyramid with a parallelogram base, certain parallelism relations can be inferred based on the properties of the base and how the apex relates to the base's vertices and edges.

- Since the base \( ABCD \) is a parallelogram, opposite sides like \( AB \parallel CD \) and \( AD \parallel BC \).
- If we consider the lines involving the apex \( S \), the parallelism with planes becomes a bit more complex and needs careful examination based on spatial reasoning.

### Correct Answer:
After analyzing, **option B \( CD \parallel (SAD) \)** is correct. The line \( CD \), being part of the parallelogram base, is parallel to the plane \( (SAD) \), which includes two other vertices of the parallelogram.

Would you like further explanation on this or have any specific questions?

Here are 5 related questions you might explore:
1. What are the properties of a pyramid with a parallelogram base?
2. How do we determine if a line is parallel to a plane in geometry?
3. What is the geometric significance of parallelism between a line and a plane?
4. How can we apply the concept of vectors to check parallelism between lines and planes?
5. What are other types of pyramids and how do their properties differ?

**Tip:** Always visualize 3D figures to better understand the relationships between lines and planes.

Cho hình chóp S.ABCD có đáy ABCD là hình bình hành. Mệnh đề nào sau đây là đúng?

Analyze a pyramid with a parallelogram base and determine the correct statement about line-plane parallelism. This problem explores key geometry concepts such as parallelism, spatial reasoning, and properties of 3D shapes. Suitable for high school students (Grades 9-12).

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