A cross-section is the intersection of a volume and a plane.
For a given volume, let's say a sphere, a cross-section is a given "cut" of that sphere.
For example, when you take a fruit and you cut it in half, if you look at the cut part (the interior of the fruit) that would be a cross-section of the fruit.
Now, to "cut" the volume, it must be intersected by something that has a defined surface, but no volume, and that is a plane.
So a cross-section is defined by the intersection of a volume and a plane.
If you want to learn more about geometry, you can read:
https://brainly.com/question/3603397
