The Elements of geometrie of the most auncient philosopher Evclide of Megara (1570)
Euclid · London, Imprinted by I. Daye · leaf 1049
/ The fif tenth cBooke and O H f'jft equal the one to tie other, and alio are equal to the faid angles HTFandTFO : but? thefe foure angles are equal to 4 . right angles by the corollary of the 3 1 .of the firil : wherefore the an¬ gles of the quadrangle HO F T are right angles .And by the fame… … bedron infcribedin the pyramis) : therfore the line S I is two third partes of the halfe line S E. And by the fame reafo, forafmuch as in the triagle DEC the line TO is proued to bea parallel to the fide DC, it {hall in the felfe fame triangle cut the lines C E and S E, proportionally in the poynts…
Geometry · Classification of sciences · Geometry -- Early works to 1800
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). 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-112-296.webp)
