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 251
dicular to the plane CD, and the straight line EG, ( which is in that plane, meets it; therefore FGE is a right an- gle«: but EF is also at right angles to the plane AB; and therefore EFG is a right angle : u wherefore two of the angles of the triangle EFG are equal to- gether to two right angles:… … PROP. XXXIX. THEOR. IN a solid parallelepiped, if the sides of two of the See N.opposite planes be divided each into two equal parts,the common section of the planes passing through thepoints of division, and the diameter of the solid paral-lelepiped cut each other into two equal parts. Let the…
Euclid's Elements · Mathematics, Greek · Geometry
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