When the vertical plane intersects the given three-dimensional object in the image and divides the object into equal halves then the shape of cross-section so obtained would be a :
Semicircle.
<h2>Step-by-step explanation:</h2>
As we know that the figure is made up by piling different circles over each other i.e. when any plane will cut the figure horizontally then we will always obtain a circle.
Hence, when this figure is cut by a vertical plane then each of the circle will be cut into half this means that we will obtain a semicircle as a cross-section.
( Since the half of a circle is always a semicircle )
