Four.
A triangular prism contains zero curved and 5 flat surfaces.
Four.
A triangular prism has five surfaces: two triangular faces, and three rectangular faces.
5
A triangular prism fits the given description
A triangular prism.
A triangular prism has 9 edges!
A triangular prism has 6 verticies
A triangular prism has five faces.
A triangular prism has 5 faces.
... are straight lines where two planar surfaces meet.
They are called faces.