It is a typographic oxymoron.
There is no such thing as a quadrangel: the nearest real word is quadrangle and that is a 2-dimensional shape with four sides. It cannot, therefore, be a shape with six sides!
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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.
five
there are three
6