Ellipses are not circles.
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Yes; the circle is a special case of an ellipse.
Ellipses (and, in the special case circles).
A surface whose plane sections are all either ellipses or circles. A football approaches being an ellipsoid as does a discus.
draw 2 circles the same size
A point has no dimensions.A line, ray or segment is one dimensional.Squares, circles, rectangles, ellipses, parabolas, etc. have two dimensions.Cubes, spheres, cylinders, polyhedrons, etc. have three dimensions.