We always referred to that as an arc.
Sector of a circle or Circular sector or Circle sector or Disk sector. All are "two radii enclosed by an arc" like a slice of pizza! :)
No.A sphere is a three dimensional object whereas a circle is a two dimensional shape
An ellipsoid * is a three dimensional figure which is symmetrical around three perpendicular axes * has a cross-section in one plane which is a a circle, and the other planes cross-sections are ellipses. In other words, it is an egg-shaped object. If you can stand an egg upright and you slice it through the middle parallel to the tabletop, you will see a circle, no matter where you slice. If you were instead to slice downwards vertically in any direction you would see an ellipse.
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