There can be no closed 3D shape with only one square and 3 triangles.
Yes.
square based pyramid
The simplest such shape is PYRAMID.
Yes. for example to make a pyramid, you need 4 triangles and a square
There can be no closed 3D shape with only one square and 3 triangles.
Square pyramid
A Triangular Pyramid has 4 triangles and 1 square.
An octagonal pyramid has eight triangles on an octagonal base. An octahedron can also be made by putting a square pyramid on another inverted square pyramid. This shape has just eight triangles and no others.
Yes.
square based pyramid
The simplest such shape is PYRAMID.
Yes. for example to make a pyramid, you need 4 triangles and a square
Triangular Prism
is a square a 3d shape
A 3D shape with all triangular faces can be a tetrahedron pyramid.
It is a square based pyramid. And the word is which, not witch!