Copy of Sections of Triangular Pyramids

Drag the blue points to see the different sections of the triangular pyramid.
When a plane intersects the triangular pyramid horizontally (or parallel) to its base, what is the shape that is formed?
When a plane intersects the triangular pyramid vertically (or perpendicular) to its base, what is the shape that is formed?
Luk
– Mikal Moore, Kara, Anthony OR 柯志明

Information: Copy of Sections of Triangular Pyramids