Many artists use a technique called 'start-with-rectangle-and-round-the-edges'this creates a near circular people most modern-day people call an oval.
We are not sure of the scientifical name of an rounded-edge rectangle, but one thing is for sure, it is not a quadrilateral because not all four edges are present.
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A 2D rectangle has no edges but has 4 boundaries, and a 3D rectangle is a rectangular prism and has 12 edges.
A rectangle has 6 faces, 12 edges, and 8 corners. Wrong, that's a cube.
Two rounded edges
A cube and a rectangle all have 12 edges.
A rectangle is a plane figure and so has only one face. It has four sides (edges) and four vertices.