Elements of geometry : containing books I to VI and portions of books XI and XII of Euclid, with exercises and notes (1881)
Smith, J. Hamblin (James Hamblin), 1829-1901, Kirkland, Thomas, 1835-1898 · Toronto : W.J. Gage · leaf 340
two rt. z s, -I. 32. .-. the nine z s CBA, BAC, ACB, ACD, CDA, DAC, ADB,DBA, BAD are together equal to sLx rt. z s ; and of thesethe six zs CBA, ACB, ACD, CDA, ADB, DBA, havebeen proved to be together greater than two rt. z s, and .-. the three z s BAC, CAD, DAB, which contain thesolid z at A, are… … Let the planes, in which the z s are, be cut by a plane, andle<- the common sections of it with those planes be BC, CD,DE, EF, FB. Then .• the solid z at -B is contained by the three planez s CBA, ABF, FBC, of which any two are together greaterthan the third, XI. 20. .-. z s CBA, ABFcue together…
Geometry · Geometry, Plane
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