Elements of geometry : containing the first six books of Euclid, with a supplement on the quadrature of the circle, and the geometry of solids : to which are added, Elements of plane and spherical geometry (1826)
Playfair, John, 1748-1819, Euclid · Philadelphia : Marot & Walter · leaf 287
s it stands in the original, is considerably embarrass-^ed and obscure. His enunciation, with very little variation, is re-tained here. PROP. XXI. It is essential to the truth of this proposition, that the straight linesdrawn to the point within the triangle be drawn from the two extre-mities of… … 286 NOTES, Alexandrinus ia the 3(1 Book of his Mathematical Collections^hut thedeinonsJratiun ia of a kiinl that does not helonsj to this place. If it berequired simply to show, thai in certaiii cases the sum of the tvVo linesdrawn to the point within tiie trian;^le may exceed the sum ot thesides…
Euclid's Elements · Geometry · Trigonometry
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