A pyramid has a square base and triangular sides that connect the base to the apex. When you take a vertical cross-section of a pyramid, the resulting shape typically has the following characteristics:
- One edge along the base (which can be considered a single side).
- Two triangular edges on either side of the cross-section.
- One edge that connects the apex to the base edge.
This results in a shape that has 3 sides in total (2 sides from the triangular faces and 1 from the base).
Therefore, the two-dimensional vertical cross-section of a pyramid has 3 sides.
The correct response is 3.
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