Determine the location of the focus and directrix of this conic section. Sketch the graph of this conic section which shows the focus, directrix and vertices. Assume that the earth is a sphere with ...

An Elementary Treatise on Conic Sections by the Methods of Coordinate Geometry. By C. Smith. New edition, revised and enlarged. Pp. x + 449. (London: Macmillan and Co ...

Andrea Del Centina, Pascal's "mystic hexagram", and a conjectural restoration of his lost treatise on conic sections, Archive for History of Exact Sciences, Vol. 74, No. 5 (September 2020), pp.