Analytic geometry, for technical schools and colleges (1897)
Lambert, Preston Albert, 1862-1925 · New York, Macmillan · leaf 31
cone. F, F are the points of contact of the spheres with the cutting plane; F any point in the intersection of plane and surface ofcone; T, T the points of contactof element of cone through Pwith spheres. The plane of theelements Sa, Sa is perpendicularto the cutting plane and the planeof the… … lar triangles FDT and FDT, FTFT PDFD hence r>y composition FF PD TT -, by interchanging means,1)1/ ^ * * FD PF ^ PDFF PDPF _ TVDD J^W PD P77 a constant. Similarly, ^^- = -^, i-^^TT DD PD TTDD • Call the points * Cayley, in the article on Analytic Geometry in tlie Britannioa, niiiMiedition, calls…
Geometry, Analytic
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