The elements of navigation : containing the theory and practice, with all the necessary tables, to which is added, a treatise of marine fortification ... (1754)
Robertson, J. (John), 1712-1776, Adams, Charles Francis, 1807-1886, former owner. BRL, Adams, John, 1735-1826, former owner. BRL, Boston Public Library) John Adams Library BRL · London : Printed for J. Nourse ... · leaf 91
s of the feg-ments of the lines ab, ac : Alfo the like may be readily inferred at anyother divifions of the lines a b, a a. Therefore lines parallel to b c, cut off like parts from the lines ab, ac.Then ab : ac : : ad : ae. And ab: ac:: bd: ce. (233) Therefore ad : ae : : bd : c e. (238) And by… … 2510. THEOREM XXVI. In equiangular triangles (abc, abc), the fidesabout the equal angles are proportional; and the fidesoppofite to equal angles are alfo proportional. „ Dem. IncA, cb, takecD=£tf, ce ==<:£; anddrawDE.A fj ~b Then thetrianglescDE,<:tf^,beingcongruous.( 189) The^.tDE = (Z.fl=)…
Navigation · Nautical astronomy · Fortification
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