Question

What shape best describes the cross section cut parallel to the base of a right rectangular prism?

Answer 1

To answer this question, it is enough to find the volume of a rectangular prism.
 The volume of a rectangular prism is:
 $V = Ab * h$
 Where,
 Ab: base area
 h: height
 The area of the base is:
 $Ab = w * l$
 Where,
 w: width
 l: long
 We observe that the area of the base is a rectangle, therefore, the section parallel to the base is also a rectangle.
 Answer: 
 The cross section cut parallel to the base of a right rectangular prism is:
 Rectangle

Answer 2

The cross section of a rectangular prism is a rectangle. The cross section is the shape that results from cutting straight through a prism.