A ray. When there are no points, its a line. When it has two points, its a line segment.
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Octagon
eight * * * * * A triangular pyramid has six edges: three edges that form the triangular base and then three more edges going up from each vertex of the base to the apex (peak) of the pyramid.
The difference in a triangular and rectangular pyramid only has to do with the base of the pyramid, which in turn decide how many sides the pyramid will have. A triangular pyramid has a base shaped like a triangle, which ends up having a total of 4 sides (including the base itself). A rectangular pyramid has a rectangular base, which ends up having a total of 5 sides (including the base itself).
A triangular pyramid consists of a triangular base. Attached to each side of the triangular base is a triangular face and these all meet up at the apex of the pyramid. There are, therefore, 6 edges, 4 bases and 4 vertices.
Two equilateral triangles or one rhombus.