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 213
are parallel. For the same reasorii because the two Book XI.parallel planes GH, KL are cut ^-v^ by the plane AXFC, the com- / _-—!>. / H a 16.11. men sections AC, XF are paral-lel: and because EX is paral-lel to BD, a side of the triangleABD, as AE to EB so is ^ AXto XD. Again, because XF… … c 11. S; PROP. XVIII. THEOR. IF a straight line be at right angles to a plane, eve-ry plane which passes through it shall be at right an-gles to that plane. Let the straight line AB be at right angles to a plane CK;every plane which passes through AB shall be at right angles to,the plane CK. Let…
Euclid's Elements · Mathematics, Greek · Geometry
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