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 149
J J 146 THE ELEMENTS OF EUULID. BOOK VS. … oppoiite sides of parallelograms areequal to one another (34. 1.), AB is(7. 5.) to AD, as AE to AG; and DC to CB, as GF to FE; and also CD to G !■ ^=4 —/ H DA, as FG to GA: therefore the sidesof the parallelograms ABCD, AEFGabout the equal angles are propor-tionals; and they are therefore simi-lar…
Mathematics, Greek · Geometry · Trigonometry
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