Just one: the base. The other 4 faces are triangles.
One square or rectangle as it's base, and the other sides are triangles.
a square pyramid
What figure has 2 triangular faces and 3 rectangular faces? The figure that has 2 triangular faces and 3 rectangular faces is known as a triangular prism. It looks like a standard two-pole tent, or the outer packaging of a bar of Toblerone.The object a triangular prism.
A rectangular-based pyramid.
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.
the other faces on a pentagonal prism would be rectangular
There is no such shape - unless there are other faces. If there is one rectangular face then you require at least four other faces - one on each edge of the rectangle - making a minimum of 5 faces.
It has 4 faces, 4 corners, and 4 edges, but two edges are different from each other. All the corners are right angles.
A minimum of 2 triangles are needed, but you can also make a rectangle with 3 or more triangles.