Question

which figure is a triangular prism?

Explanation:

A triangular prism has two triangular bases (congruent and parallel) and three rectangular lateral faces. Let's analyze each figure:

• First figure: Has a pentagonal base (not triangular), so not a triangular prism.
• Second figure: A pyramid (has a single base and triangular faces meeting at a vertex), not a prism.
• Third figure: Two triangular bases (front and back) and three rectangular faces connecting them, matching the definition of a triangular prism.
• Fourth figure: A pyramid (single base, triangular faces meeting at a vertex), not a prism.

Answer:

The third figure (the one with two triangular bases and three rectangular lateral faces) is the triangular prism.