Ellipse

A cone and a cylinder can be cut by the same ellipse.

Now the property of a circle is that every point of it is situated at the same distance from the centre, but in an ellipse there are two points within it, the "foci," and the sum of the distances of any point on the circumference from these two foci is constant.

In B's response to A's question:- (A: Would you like to go out?, B: I'd love to), the words that are ellipsed are go out.