Rectangles are 2-dimensional figures- they lie in a plane- they have four vertices
There really is no such thing as a 3D rectangle. If you mean a rectangular prism, it has 8 vertices, 4 on each of its two parallel faces.
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A rectangle has 4 vertices and they each measure 90 degrees
4
A cube has 6 faces
A rectangle has 4 sides, which are also its edges. It has 4 vertices where the sides meet. In terms of faces, a rectangle is a 2-dimensional shape and therefore only has one face, which is the flat surface enclosed by the four sides.
Since it has 9 faces it is a nonahedron. Not sure how many of the thousands of nonahedrons have 6 vertices.