A quadrangular is an adjective, not a noun. A quadrangular pyramid will have a different number of faces from a quadrangular prism, for example.
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.
5
five
8
5
Six faces.
6
Eight edges.
They have 6.
there are three
There are 5 faces in a pyramid.