It depends on the 3d shape.
Its a 3d net that can be transformed into a 3d shape
Square pyramid
The three-dimensional shape consisting of 4 triangles is called a pyramid, or a triangular prism.
duodecahedron is a 3D shape that has 20 triangles as it's base
There can be no closed 3D shape with only one square and 3 triangles.
It depends on the 3d shape.
A 3D shape with all triangular faces can be a tetrahedron pyramid.
Its a 3d net that can be transformed into a 3d shape
Tetrahedron.
A tetrahedron has four equilateral triangles as sides
The simplest such shape is PYRAMID.
Square pyramid
Yes.
The three-dimensional shape consisting of 4 triangles is called a pyramid, or a triangular prism.
A net is a 2D representation of a 3D shape
a net