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 (1806)
Euclid, Simson, Robert, 1687-1768, Euclid. Elements. Book 11-12. English. 1806, Euclid. Data. English. 1806, Simson, Robert, 1687-1768. Notes, critical and geometrical. 1806, Simson, Robert, 1687-1768. Elements of plane and spherical trigonometry. 1806 · Philadelphia : Published by Mathew Cary, and sold by J. Conrad & Co., S.F. Bradford, Birch & Small, and Samuel Etheridge, printed by T. & G. Palmer ... · leaf 107
A by the straight lines BD, CD » 9-1-meeting one another in the point D, from which draw DE, ^2-1.DF, DG perpendiculars to AB, A BC, CA: and because the angleEBD is equal to the angle FBD,for the angle ABC is bisected by BD, and that the right angleBED is equal to the right angleBFD, the two… … 106 THE ELEMENTS Book IV. equal c; wherefore DE is equal to DF: for the same reason,v.^vr-*> DG is equal to DF; therefore the three straight lines DE, DF,c 26.1. DG are equal to one another, and the circle described from thecentre D, at the distance of any of them, shall pass through…
Euclid's Elements · Mathematics, Greek · Geometry
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