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 245
are above the planes of the angles. Let BAC, EDF be two equal plane angles; and from thepoints A, D let the straight lines AG, DM be elevated abovethe planes of the angles, making equal angles with their sides,e£^ch to each, viz. the angle GAB equal to the angle MDE, andG/VC to MDF; and in AG, DM… … Make AH equal to DM, and through H draw HK parallelto GL: but GL is perpendicular to the plane BAC; where-fore HK is perpendicular » to the same plane : from the points * 8. HK, N, to the straight lines AB, AC, DE, DF, draw perpen-Uicula/s KB, KC, NE, NF; and join HB, BC, ME, EF; 244 THE ELEMENTS…
Euclid's Elements · Mathematics, Greek · Geometry
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