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any cross section of a sphere is a circle.
When a sphere is cut with a vertical angled plane, the cross-section will be an ellipse. If the sphere is then cut by a horizontal plane, the cross-section will be a circle. Thus, the combination of these two cuts results in an elliptical cross-section from the angled cut and circular cross-sections from the horizontal cuts at various heights.
A sphere is.
No. A circle is 2-dimensional. A sphere, however, is a 3-dimensional object with circular cross-sections.
Every cross-section of a sphere is a circle.