The simplest such shape is PYRAMID.
square based pyramid
A tetrahedron.
Yes. for example to make a pyramid, you need 4 triangles and a square
Well, any shape with a triangular face. I assume that you mean a shape that only has (identical) triangles for faces. There are 2: the tetrahedron with 4 triangles, and the icosahedron with 20 triangles. * * * * * What about a triangular dipyramid? Two triangular pyramids stuck together along one face?
The simplest such shape is PYRAMID.
The three-dimensional shape consisting of 4 triangles is called a pyramid, or a triangular prism.
A tetrahedron has four equilateral triangles as sides
Square pyramid
A Triangular Pyramid has 4 triangles and 1 square.
A tetrahedron (triangular pyramid).
square based pyramid
There is no 3D shape with 6 faces: 4 rectangles and 2 triangles. See the link for all forms of hexahedra.
A three-sided pyramid, also termed a triangular prism.
pyramid
A rectangular based pyramid would fit the given description
It doesn't exist. The least number of sides for a 3-D shape only made of triangles is 4.