Are The edges of a polyhedron are the polygons which bound the polyhedron?

False

its a 3-d trangle and i want to know if its a polygon or a polyhedron

that's a statement, but if you ment to say are the... then yes

Edges meet at a vertex.

The number of edges and vertices ina polyhedron will depend on the polyhedron one selects either to study, build or etc...