Smart, Edward Howard · London : Macmillian and Co. · leaf 257
(using this notation as before todenote the range determined onthe line b or/by the lines c, d, e, a). … Fig. 1155. Considering the sections of thesepencils by DE and CD respectively,we have {MDEG} = {CDLK}. But these ranges have a commonpoint D. .-. by § 2, Chap. XIII., MC,EL, GK are concurrent. Considering the pencils sub-tended by these ranges at [de) and{cd) respective!}, we have{mdeg] = {cdlk}.…
Geometry, Projective
Internet Archive · California Digital Library · Public Domain Mark 1.0. Free to use for anything.
![An illustration from Divina proportione : opera a tutti glingegni perspicaci e curiosi necessaria oue ciascun studioso di philosophia: prospettiua pictura sculptura: architectura: musica: e altre mathematice: suavissima: sotile: e admirabile doctrina consequira: e delecterassi: co[n] varie questione de secretissima scientia (1509)](https://img.insideoutlibrary.com/img/200/ia-divinaproportion00paci-86-129.webp)
