Eight edges.
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
5
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It has 5 sides
3 faces
It has 5 sides
A quadrangular prism is a "box". There are 6 faces, 8 vertices and 12 edges. BTW, this satisfies Euler's Formula of F + V = E + 2.
a pyramid has 8 edges