There can be a quadrangular pyramid or a quadrangular prism or other quadrangular shapes. "Quadrangular" is an adjective, not a noun. You need to be more specific.
A quadrangular is an adjective, not a noun. A quadrangular pyramid will have a different number of faces from a quadrangular prism, for example.
5
five
8
Eight edges.
3 faces
12
A Square Pyramid Has 5 Vertexes
5 vertexes, 4 faces, and 8 edges
A pyramid has eight edges, or vertexes.
A pyramid is a solid with a (convex) polygonal base and triangular sides all terminating in the same point. As such the number of "corners" (topologists call them vertexes) is one more than the number of vertexes of the base. A "square pyramid" (such as those famous structures in Giza, Egypt, has five vertexes. A tetrahedron is also a pyramid but one that has only 4 vertexes (the fewest of all the pyramidal shapes). 3