There is no such thing as a 3d triangle. A 3d shape which has only equilateral triangular faces can be a tetrahedron which has 4 faces or an icosahedron which has 20.
An equilateral triangle has one surface.
8
A 3-d triangle, or a tetrahedron, has 4 vertices.
none because a triangle is not a 3D object
5 Flat surfaces 4 flat surfaces (3 for the sides and 1 for the base).
1
Six.
There are 5 flat surfaces.
An equilateral triangle has one surface.
8
There is no such thing as a 3D triangle.
square based triangle
One: A 3D triangle
A 3-d triangle, or a tetrahedron, has 4 vertices.
none because a triangle is not a 3D object
5 Flat surfaces 4 flat surfaces (3 for the sides and 1 for the base).
6 because 3x2