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 280
angles A, B, C, of which A is not less thaneither of the other two, and such, that A and B together are lessthan two right angles: and by problem 1, and its corollary, find afourth angle D such, that any three whatever of the angles A, B,C, D be greater than the remaining angle, and such, that A… … E, be greater than the third: and because A and B together areless than two right angles, the double of A and B together is lessthan four right angles: but A and B together are greater thanthe angle E; wherefore the double of A, B together is greaterthan the three angles A, B, E together, which…
Mathematics, Greek · Geometry · Trigonometry
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