It is a horizontal cross-section. Its shape will depend on the shape of the solid and its orientation.
Every solid. All you need is the intersection with a plane parallel to the base.
Section plane is the intersection of a plane cutting through a solid
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A cylinder
Sphere
Every solid. All you need is the intersection with a plane parallel to the base.
Section of the plane.
The answer would be a right cylinder. A right cylinder is a cylinder that has a closed circular surface having two parallel bases on both the ends and whose elements are perpendicular to its base.
It is a cross section.
Section plane is the intersection of a plane cutting through a solid
A prism. A prism is named for its base, eg a triangular prism has a triangle for the base. If the base is a circle, the circular prism is called a cylinder.
Both a cylinder and a prism can have parallel and congruent bases.
cylinder
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An upright pentagonal prism has two congruent parallel bases and 15 edges.
A Prism
It is a polygonal prism.