Describe the two-dimensional figure that results from making a perpendicular slice to a right rectangular pyramid that goes from the base through the apex.

Trapezoid
Square
Triangle
Hexagon

The two-dimensional figure that results from making a perpendicular slice to a right rectangular pyramid that goes from the base through the apex is a triangle. The triangle will have a right angle at the apex and its other two sides will be the slant height of the pyramid, creating a shape similar to a right triangle.