What polygons are not formed by the cross-section created when a plane intersects a cube?

A Circle and a Pentagon are not formed
 
A plane intersecting a cube can form a square, a trapezoid, a triangle, and a rectangle because a square is a rectangle and a rectangle is a trapezoid.Also, intersecting the plane through the diagonal of the cube will form a triangle.

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Atranslation 6 units to the right and 4 down