There is only one, if you are speaking of a regular triangle drawn on a paper. However, if you are speaking about a pyramid, similair to the triangle but in 3-D, then there are 5. All of the sides are made of triangles apart from the base, which is a square.
a rectangle
A cuboid has 6 sides/faces/flat surfaces.
A cube has 6 faces, so it would have 6 flat surfaces
cube There are a great many solid shapes that have only flat surfaces.
2 flat surfaces unless it is rolled up in which case it has 2 curved surfaces.
There are 5 flat surfaces.
5 Flat surfaces 4 flat surfaces (3 for the sides and 1 for the base).
a rectangle
Triangle None of them.
5 flat surfaces.
Flat surfaces: 6Curved surfaces: 0.
It has 6 faces which are its flat surfaces.
There are 2 flat surfaces, both are circles.
A square has 4 flat surfaces.
A cuboid has got six flat surfaces.
A cuboid has 6 sides/faces/flat surfaces.
2 flat and 1 curved