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 91
f of DAB, andEBA the half of ABC; the angle EAB is equal to the angle EBA;Avherefore the side EA is equal (6.1.) to the side EB: in the samemanner, it may be demonstrated that the straight lines EC, EDare each of them equal to EA or EB: therefore the four straightlines EA, EB, EC, ED are equal to… … PROP. X. PROB. To describe an isosceles triangle, having each of theangles at the base double of the third angle. Take any straight line AB, and divide (11. 2.) it in the pointC, so that the rectangle AB, BC be equal to the square of CA;and from the centre A, at the distance AB, describe the…
Mathematics, Greek · Geometry · Trigonometry
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