8
An equilateral triangle has one surface.
A 3-d triangle, or a tetrahedron, has 4 vertices.
none because a triangle is not a 3D object
Cone
1
Six.
There are 5 flat surfaces.
8
An equilateral triangle has one surface.
There is no such thing as a 3D triangle.
One: A 3D triangle
A 3-d triangle, or a tetrahedron, has 4 vertices.
none because a triangle is not a 3D object
square based triangle
6 because 3x2
Cone