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 249
efore (4. 1.) the angle AGF isequal to CHF, and AFG to the angleCFH: to these last add the commonangles AFH; therefore the two anglesAFG, AFH are equal to the two an-gles CFH, HFA, which two last areequal together to two right angles (13.1.), therefore also AFG, AFH are equalto two right angles,… … PROP. V. If two straight lines AB, CD, be cut by a third ACE so as tomake the interior angles BAC, ACD, on the same side of it, to-gether less than two right angles; AB and CD being producedshall meet one another towards the parts on which are the twoangles which are less than two right angles. At…
Mathematics, Greek · Geometry · Trigonometry
Internet Archive · California Digital Library · Public Domain Mark 1.0. Free to use for anything.
