[[Image:658px-Elipse svg.png|right|thumb|400px|In the figure, ''a'' is the semi-major axis, ''b'' is the semi-minor axis, F1 and F2 are the two focal points. The distance F1-X-F2 is constant.]]
An ellipse is a figure that looks like a squashed circle. The more squashed it is, the greater its [[eccentricity]].
An ellipse is a figure that looks like a squashed circle. The more squashed it is, the greater its [[eccentricity]].