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Only one; a triangle is a 2D shape, not a 3D shape. Usually only 3D (or more) shapes are considered to have 'faces'.
5
3
Four.
Four
4
four triangle faces.
There are 2 triangle base faces, and 3 rectangle faces. 5 total faces.
5 faces
1
7.5
a 2d triangle has 1 face known as a plane but a triangular prism has 4 faces
trianle have no faces, because it is 2D figure.
One
None.