Ellipses and Circles. Section 10.3. 1 st Definition of a Circle. A circle is a conic section formed by a plane intersecting one cone perpendicular to the axis of the double-napped cone. The degenerate conic section that is associated with a circle is a point. 2 nd Definition of a Circle.
End of 1st Day
where the major axis is horizontal.
where the major axis is vertical.
What type of ellipse is this ellipse?
(2, 3), (2, −5)
(3, −1), (1, −1)