a triangle
A Triangular Prism
a triangular prism
Tetrahedron.
A prism
If it also has two triangular faces, then a triangular prism. If it has only three rectangualr faces, there is no such shape.
A triangular based pyramid would fit the given description
A triangular pyramid is a tetrahedron, or a solid three-dimensional figure made up of four triangular faces.
A triangular prism - if the three rectangular face are not ALL the faces.
A 3D shape with one base and three faces can only have triangular faces.
Triangular prisim. The three faces are rectangles, while the two bases are triangles.
A triangular prism has three rectangular faces and two triangular faces.
A solid with five plane faces is known as a tetrahedron. A tetrahedron has four triangular faces and one additional triangular face, making it a total of five faces. It is one of the simplest three-dimensional shapes in geometry and is classified as a type of polyhedron.