The elements of Euclid : viz, the first six books, together with the eleventh and twelfth : the errors, by which Theon, or others, have long ago vitiated these books, are corrected, and some of Euclid's demonstrations are restored : also, The book of Euclid's data, in like manner corrected (1834)
Euclid, Euclid, Simson, Robert, 1687-1768 · Philadelphia : Desilver & Thomas · leaf 22
raight lines ABC, ABD have thesegment AB common to both of them. From the point B drawBE at right angles to AB; and because ABC is a straight line,the angle CBE is equal (10. Def. E 1.) to the angle EBA; in thesame manner, because ABD is astraight line, the angle DBE isequal to the angle EiBA;… … PROP. XII. PROB. To draw a straight line perpendicular to a givenstraight line of an unlimited length, from a given pointwithout it. Let AB be the given straight line, which may be produced toany length both ways, and let C be a point without it. It is re-quired to draw a straight line per-…
Mathematics, Greek · Geometry · Trigonometry
Internet Archive · California Digital 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-65-42.webp)
