[Math] How to know what type of cross section is it going to be

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A plane intersects a right rectangular pyramid. Producing a cross section. The plane is parallel to the base. What shape is the cross section? enter image description here

I thought it would be triangle cause triangle cut is going to be triangle right? Also I don't really understand what cross section is? How do i do these types of question?

Best Answer

Hint: A cross section is the shape that arises in the intersection of a plane and any solid. For example, if you cut a sphere in half, you will get a circle on the side you cut. The circle is the cross section of the sphere.

These gifs will visualize various cross sections of a cube, I hope: enter image description here

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