Question

this rectangular prism is cut by the plane shown. the plane is perpendicular to the base of the rectangular prism. what is the shape of the cross - section?
a rectangle.
b rhombus.
c square.
d trapezoid.

Explanation:

A plane perpendicular to the base of a rectangular prism will intersect four faces of the prism, forming a quadrilateral with four right angles. A rectangle is defined as a quadrilateral with four right angles, and there is no indication the sides are equal (ruling out square) or that only one pair of sides is parallel (ruling out trapezoid) or that all sides are equal without right angles (ruling out rhombus).

Answer:

A. rectangle.