https://file.aiquickdraw.com/mathbot/file/17269702012627kadnkik.jpg

The question in the image asks: 

"Cái hình chóp tứ giác bởi một mặt phẳng vuông góc với đường cao của hình chóp sẽ là hình gì?"

Translation:
"The quadrilateral pyramid cut by a plane perpendicular to the height of the pyramid will form which shape?"

The options given are:
A. A parallelogram  
B. A pentagon  
C. A quadrilateral  
D. A triangle

### Answer Explanation:
When a quadrilateral pyramid (which has a four-sided base) is intersected by a plane perpendicular to its height, the resulting cross-section depends on the position of the cut. If the cut is made parallel to the base of the pyramid, the cross-section will be a quadrilateral. Therefore, the correct answer is **C. A quadrilateral**.

Would you like further explanation or details on how cross-sections of pyramids are formed?

Here are five related questions:
1. What shape is formed when a triangular pyramid is cut perpendicular to its height?
2. How does the position of the cutting plane affect the cross-section of a pyramid?
3. Can the cross-section of a pyramid be a circle? Why or why not?
4. What is the general rule for the shape of a cross-section of any pyramid?
5. What would the cross-section look like if the plane is not perpendicular to the height?

**Tip**: Cross-sections in geometry are helpful for understanding 3D objects in different planes!

Cái hình chóp tứ giác bởi một mặt phẳng vuông góc với đường cao của hình chóp sẽ là hình gì?

Explore the cross-section of a quadrilateral pyramid when cut by a plane perpendicular to its height. Understand how the cutting plane affects the resulting shape, with detailed geometric explanations. Suitable for high school students studying geometry.

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