There are many possible answers but the most likely one, for your level, is a triangular prism.
A solid figure with five faces is called a pyramid. Specifically, a triangular pyramid, or tetrahedron, has four triangular faces, while a square pyramid has one square base and four triangular faces, totaling five. The pyramid's faces meet at a single point called the apex.
A pyramid
A square pyramid
Each of them has four triangular faces.
Triangular based pyramid
A pyramid
A square pyramid
A 3-dimensional figure with 5 faces is a triangular prism. It consists of two triangular bases and three rectangular faces connecting the corresponding sides of the bases. The total number of faces in a triangular prism is 5.
Triangular prism
a square pyramid (i found it in my sons math book !)
A triangular prism.
A triangular prism.
A triangular prism has 2 triangular faces and 3 rectangular faces.
triangular pyramid
A triangular prism.
Four triangular faces.
A Triangular Prism