One - the section of the plane in which it lies.
A triangle has 3 edges and 1 face.
1
Vertices
8
With a triangle base there are four sides including the base
Triangle
pentagonal square
An octohedron, or diamond
a triangular pyramid has 4 triangular sides
four triangle faces.
There are 2 triangle base faces, and 3 rectangle faces. 5 total faces.
5 faces
1
5
7.5
3
1
trianle have no faces, because it is 2D figure.
a 2d triangle has 1 face known as a plane but a triangular prism has 4 faces
5 .
One