Question

A right rectangular prism is shown. What shape best describes the cross section cut perpendicular to the base of a right rectangular prism? Parallelogram Trapezoid Rectangle Square

Answer 1

The answer is C, Rectangle because if you think about it you are looking at a rectangular prism and you cut the cross - section perpendicular to the base of the right rectangular prism the shape will be a rectangle.

Answer 2

Since the cross section is constrained to be perpendicular to the base, the shape of it is constrained to be a ...
  Rectangle

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That rectangle may be a square, but is not required to be.