Question

a plane intersects a pyramid where the plane is perpendicular to the base of the pyramid. which statement is true? a) the cross - section must be a triangle. b) the cross - section must be a rectangle. c) the cross - section must be a trapezoid. d) the cross - section could be multiple possible polygons.

Explanation:

When a plane is perpendicular to the base of a pyramid, the shape of the cross - section depends on the base shape of the pyramid and the position of the intersecting plane. If the base is a triangle, the cross - section can be a triangle. If the base is a square or rectangle, depending on the cutting position, it can be a triangle, trapezoid etc. So, it could be multiple possible polygons.

Answer:

D) The cross section could be multiple possible polygons.