Elements of the Conic Sections

abfciffa abfurd alfo alſo baſe becauſe bifected bola cafe centre confequently conjugate diameters conjugate hyperbolas defcribe diame directrix diſtance draw a ftraight drawn parallel Elem equal excefs fecond axis fecond diameter fection fegments femidiameter fince foci focus fquare of CB ftraight line drawn ftraight line parallel ftraight line touching furface given in pofition greater axis interfect join latus rectum lefs let it meet likewife line be drawn meet the hyperbola meeting the afymptotes meter oppofite hyperbolas paffes paffing parallelogram perbola perpendicular plane point D point G point of contact PROP propofition rallel rect rectangle AKB rectangle contained right angles ſquare tangent THEOR theſe touch the parabola touches the ellipfis touches the hyperbola tranfverfe axis tranfverfe diameter tranſverſe triangle vertex vertices YORK PUBLIC LIBRARY