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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 143

An illustration from 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, leaf 143
iven rectili-neal figure.* Let AB be the given straight line, and CDEF the given recti-lineal figure of four sides; it is required upon the given straightline AB to describe a rectilineal figure similar and similarly situ-ated to CDEF. Join DF, and at the points A, B, in the straight line AB,… … 140 THE ELEMENTS OF EUCLID. BOOK VI. FCD is equiangular tothe triangle GAB: againat the points G, B, in thestraight line GB, make(23. I.) the angle BGHequal to the angle DFE,and the angle GBH equalto FDE: therefore the A BCD remaining anj^le FED is equal to the remaining angle GHB5 andthe triangle…

Mathematics, Greek · Geometry · Trigonometry

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