It's very difficult to determine an answer, since
there is no such thing as a rectangular triangle.
Chat with our AI personalities
most likely a triangular prism
This depends on whether or not the prism is a rectangular prism or not. Simple shape prisms (rectangular, triangle, octagonal, hexagonal) all have rectangular faces.
A rectangular prism is the only shape that is made up from only rectangular faces. But there are countless shapes which contain rectangular faces along with other shapes.
triangular prism
A rectangular prism