Question

Which of these polygons is not formed by the cross-section created when a plane intersects a cube? Select all that are possible.

square
circle
pentagon
octagon
triangle
rectangle

Answer 1

A circle is not possible. Neither is a square or a rectangle.

Explanation:

Answer 2

Circle

Octagon

Explanation:

There are no curves in a cube to make a circular cross section, and there aren't enough edges to make an octagon (just visualize)