It is a tetrahedron which is a triangular based pyramid having 4 faces, 6 edges and 4 vertices
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A pyramid has 4 flat faces, all of which are triangular. Don't confuse this with a square-based pyramid like those in Egypt, as they have 5 faces.
False. A solid figure that cannot roll does not necessarily have faces. The ability to roll is determined by the shape and symmetry of the figure, not by the presence of faces. For example, a sphere is a solid figure that cannot roll, but it does not have faces.
You are a pyramid!
A pyramid can have a polygon with any number of sides as its base. A triangular pyramid (tetrahedron, the Platonic solid) and the rectangular based pyramid (like the Egyptian ones) are better known, but that is simply a result of poor imagination. If a pyramid has an n-gon as its base then it will have: 2 * n edges n + 1 faces and n + 1 vertices.
There are two 3D shapes with five faces: Triangular prisms and rectangular pyramids.