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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38+105= 143, 39+104=143, and you will find then adding the numbers on opposite sides, moving inwards yields the answer 138 every time. because of this, you’re going to multiply 138 times the number of pairs, which is 34. therefore, 34*138= 4692(i’m sorry if it’s the wrong numbers, but it’s the right concept)