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The image presents a geometry problem about a pyramid \( S.ABCD \) with a parallelogram base \( ABCD \). Points \( I \), \( J \), and \( K \) are the midpoints of edges \( SA \), \( BC \), and \( CD \), respectively. The question asks for the shape of the intersection of the pyramid \( S.ABCD \) with the plane determined by the points \( IJK \).

The correct answer marked is \( D \), indicating that the cross-section is a quadrilateral (hình tứ giác).

### Explanation:
In a 3D geometric problem like this, when a plane intersects a pyramid, the shape of the cross-section depends on how the plane cuts through the faces of the pyramid. Since \( ABCD \) is a parallelogram and the plane passes through midpoints of the edges \( SA \), \( BC \), and \( CD \), it will result in a quadrilateral.

### Related Questions:
1. How do you determine the shape of a cross-section in a pyramid?
2. What is the significance of the midpoints in determining the cross-section shape?
3. How does the type of base (parallelogram in this case) affect the cross-section of the pyramid?
4. What methods can you use to calculate the area of a quadrilateral cross-section in a 3D shape?
5. How would the cross-section change if the base were a rectangle instead of a parallelogram?

### Tip:
When solving 3D geometry problems, visualizing the shape and using the properties of the base and the cutting plane helps significantly in determining the shape of the intersection.

Cho hình chóp S.ABCD có đáy ABCD là hình bình hành. Gọi I, J, K lần lượt là trung điểm các cạnh SA, BC, CD. Thiết diện của S.ABCD cắt bởi mặt phẳng (IJK) là hình gì?

This problem involves a pyramid with a parallelogram base. It asks for the shape of the cross-section formed by a plane passing through the midpoints of three specific edges. Explore how 3D geometry concepts and properties of a parallelogram are applied to determine the cross-section as a quadrilateral.

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