Answer:
A triangular pyramid is one with a triangle shaped base and triangular sides (4 sides, all of them identical), therefore it would only have 6 edges and 4 vertices
There are eight edges in a triangular pyramid, and there are five vertices on a triangular pyramid.
Edges are the places where two flat surfaces meet.
Vertices are the places where three or more flat surfaces meet.
* * * * *
The sides of a triangular pyramid need not be identical.