Answer:
prism
Explanation:
The figure will not be a cube, because a cube does not have any triangular faces.
The figure will not be a pyramid, because a pyramid has a triangular face for each edge of the base.
The figure will not be a triangle, because a triangle is a plane figure.
The figure will be a triangular prism: a figure with parallel bases, each having 3 edges, and a rectangular face associated with each of those edges.