The first six books of the Elements of Euclid, in which coloured diagrams and symbols are used instead of letters .. (1847)
Euclid, Byrne, Oliver · London, W. Pickering · leaf 115
ciiitiifl . And fo of others III. Alfo the lines making equal angles with that whichpaffes through the centre are equal, whether falling onthe concave or convex circumference ; and no third linecan be drawn equal to them from the fame point to thecircumference. For if ■■■make r~ -»■•■■ 9 but making… … 84 BOOK III. PROP. Fill. THEOR. Then in > and / we have and L A common, and alio ^ = , - = (B. i. pr. 4.); but which is abfurd. .....<>... is not :z: --_ * •>■> ■■■■•■■ nor to any partof -...-___ 9 /. ■■■■ is not CZ —-----. Neither is ■•• ■• C ■••■—~, they are .*. = to each other.…
Geometry
Internet Archive · Thomas Fisher Rare Book Library · Public Domain Mark 1.0. Free to use for anything.
![An illustration from Nicolai Copernici Torinensis De reuolutionibus orbium coelestium, libri VI : Habes in hoc opere iam recens nato, & aedito, studiose lector, motus stellarum, tam fixarum, quàm erraticarum, cum ex ueteribus, tum etiam ex recentibus obseruationibus restitutos: & nouis insuper ac admirabilibus hypothesibus ornatos. Habes etiam tabulas expeditissimas, ex quibus eosdem ad quoduis tempus quàm facillime caculare poteris. Igitur eme, lege, fruere. [Line in Greek] (1543)](https://img.insideoutlibrary.com/img/200/ia-nicolaicopernici00cope-306-199.webp)
