A cylinder has a circular cross section that is parallel to its base.
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The cross section of a sphere is most often a circle. When the cross section is taken parallel to the base of a cylinder, it is also a circle.
A cone or a pyramid.
A pyramid or cone.
No. Some of the classic curves studied by mathematicians: ellipses, hyperbola are cross sections of a cone taken at an angle.
It could easily be taken for a trapezoid.