Description: Using the formulas for the volume of triangular prism and cube to solve some solid geometry problems. Created by Sal Khan. This is what a triangular prism looks like, where it has a triangle on one, two faces, and they're kind of separated. The other types of triangular three-dimensional figures is you might see pyramids. You could also have a triangular pyramid, which it's just literally every side is a triangle.*Teacher Advisor is 100% free.