An introductory account of certain modern ideas and methods in plane analytical geometry (1894)
Scott, Charlotte Angas, b. 1858 · London, New York : Macmillan and Co. · leaf 162
ermined by concurrent linesa, b, c, can be altered to a certain extent, viz., the two anglesab, be can be made to assume any desired magnitudes in theprojection: but then tlie position of any fourth line d isdetermined. For let (I, b, c, d meet in 0 : their projections meet in 0,the prr)jection of… … Fic. 37. Let h be the perpendicular from 0 to ABCD. Then as in § 3G OA.OB.H\nah = AB.li, etc. sin a?> iAnad_AB AD■ M • DC whenceTherefore sin he sin dcsin ah sin ad is unalterable by projection : it is a sin he sin dxpyojective raetric coinhmation. 153. It appears now that all descriptive…
Geometry, Analytic -- Plane
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