It will look like a 2D equilateral triangle if it is a triangular based pyramid which is called a tetrahedron.
Because a triangular pyramid has 6 edges
pyramid
Four triangular faces.
It makes a Triangular Pyramid.
Four.
octogons
They are. For all the material the use, you could make a really strong triangular pyramid.
Because a triangular pyramid has 6 edges
pyramid
A cube has 6 faces and a triangular pyramid has 5 faces. So a cube has 1 more face than a triangular prism. But a triangular pyramid has four faces. You make the call. That is correct: A triangular prism has five faces, and a cube has six faces, but a triangular pyramid has four faces.
A tetrahedron or triangular pyramid.
By bracing it with triangular shapes.
sqare
8
8
triangle and rectangle
Four triangular faces.