3.
It has no CURVED faces.
There are three rectangular faces in a triangular prism.
A rectangular prism is a cuboid. It has no curved faces.
A triangular prism contains zero curved and 5 flat surfaces.
A triangular prism has 5 faces. The size of the prism makes no difference.
A cube has six faces and a triangular prism has five faces.
It has no CURVED faces.
A triangular prism has five faces.
A triangular prism has 5 faces.
A triangular prism has 5 faces.
5 faces