There can be no closed 3D shape with only one square and 3 triangles.
Triangular Prism
A 3D shape with all triangular faces can be a tetrahedron pyramid.
Tetrahedron.
The simplest such shape is PYRAMID.
A triangular pyramid.
The three-dimensional shape consisting of 4 triangles is called a pyramid, or a triangular prism.
There can be no closed 3D shape with only one square and 3 triangles.
Triangular Prism
A 3D shape with all triangular faces can be a tetrahedron pyramid.
Tetrahedron.
A tetrahedron has four equilateral triangles as sides
triangular prisom
The simplest such shape is PYRAMID.
Square pyramid
Yes.
The triangular prism. For further clarification, message me on my message board. Thanks!