This shape's universal constant is root two plus the natural log of quantity one plus root two, and it has only one associated Dandelin sphere. When one of these curves is rolled along its mirror image, the cissoid of Diocles is formed, and if the focus of one of them is rolled along a straight line, a catenary results. As one focus of an ellipse moves to infinity with the other fixed, this curve is the [*] limit. A plane intersecting a cone parallel to its slant height 
This shape's universal constant is root two plus the natural log of quantity one plus root two, and it has only one associated Dandelin sphere. When one of these curves is rolled along its mirror image, the cissoid of Diocles is formed, and if the focus of one of them is rolled along a straight line, a catenary results. As one focus of an ellipse moves to infinity with the other fixed, this curve is the [*] limit. A plane intersecting a cone parallel to its slant height forms this section. This curve is the locus of all points equidistant from the focus and the directrix. With an eccentricity of one, for 10 points, name this conic section, the graph of a quadratic function.
This shape's universal constant is root two plus the natural log of quantity one plus root two, and it has only one associated Dandelin sphere.
parabola