Final answer:
Two-dimensional shapes are obtained from a right rectangular pyramid by making slices parallel or perpendicular to its base or sides, resulting in a rectangle, triangle, and trapezoid respectively.
Step-by-step explanation:
Two-dimensional figures like a rectangle, triangle, and trapezoid can be obtained by slicing a right rectangular pyramid at different angles and locations. When a horizontal slice is made through the pyramid, parallel to the base, the resulting shape is a smaller rectangle.
To create a triangle, one can slice the pyramid laterally, and parallel to one of the side triangles, which must also pass through the apex. A trapezoid can be formed by slicing the pyramid with a plane that is parallel to one of the slanted sides but does not pass through the apex.