It's more of a stretched out circle.
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An elipse is like a circle that is a bit flattened.an ellipse is an oval.
As the foci of an ellipse move closer together, the ellipse becomes more circular in shape. When the foci coincide, the shape is a circle. Note that circles are a subset of ellipses.
A sphere is three-dimensional whereas an ellipse is two-dimensional. An ellipse can have an oval shape but a cross section of a sphere is always circular.
a circleA pedantic edit:Also an ellipse or a wriggly loop.Any shape that has no straight edges is described as a curvilinear shape.
In a right circular cone the base is a circle and the sloped side is a sector of a circle. For a general cone, they are an ellipse and a sector of an ellipse.