5 sides.
A triangular prism or a triangular based pyramid
You can call it a "triangular prism" rather than "triangular based prism" ... saying a prism is "triangular" imply that the base is a triangle. There's no other name that I know of. A prism is just a 3d shape, so all you have to say is <type of shape> + prism to get the point across.
It is a triangular prism.
A triangular prism can have a square or triangular base.
A triangular prism has two triangular faces, a rectangular prism does not have any.
A triangular prism has a triangle and a rectangular prism doesn't.
Another name for a triangular-based prism is a triangular prism. It is a three-dimensional geometric shape with two parallel triangular bases and three rectangular faces connecting the corresponding sides of the triangles. This prism is commonly used in various applications, such as optics and architecture.
A triangular prism has a triangular cross-section. A rectangular prism has a rectangular cross-section.
A triangular prism has triangular bases, a heagonal prism has ... you guessed it! ... hexagonal bases.
A triangular prism.
There are an infinite number of shapes. A tetrahedron (triangular pyramid), a square-based pyramid, a pentagonal pyramid, a hexagonal pyramid, etc. A triangular prism, a rectangular prism (cuboid), a pentagonal prism, etc are some examples.
It could be a triangular prism or a quadrilateral based pyramid.