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.
Triangular prisim. The three faces are rectangles, while the two bases are triangles.
triangular prism
A solid figure with nine edges is a triangular prism. This shape consists of two triangular bases and three rectangular lateral faces. The edges include three edges from each triangular base and three connecting edges between the bases, totaling nine edges.
triangular prism
A Triangular Prism
A prism
A triangular pyramid is a tetrahedron, or a solid three-dimensional figure made up of four triangular faces.
triangular prisum
Triangular prisim. The three faces are rectangles, while the two bases are triangles.
A 3D shape with one base and three faces can only have triangular faces.
Triangular prism
triangular prism
a triangular prism
A solid figure with nine edges is a triangular prism. This shape consists of two triangular bases and three rectangular lateral faces. The edges include three edges from each triangular base and three connecting edges between the bases, totaling nine edges.
a trangular pramid
a triangle