Elements of geometry : containing the first six books of Euclid, with a supplement on the quadrature of the circle, and the geometry of solids : to which are added, Elements of plane and spherical geometry (1826)
Playfair, John, 1748-1819, Euclid · Philadelphia : Marot & Walter · leaf 188
es of the figure BCDEF isexterior, like the angle at D, inthe annexed figure, the reasoningin the above proposition does nothold, because the solid angles atthe base are not all contained byplane angles, of which two belongto the triangular planes, havingtheir common vertex in A, and thethird is an… … This proposition, therefore, is A Z3LEMENTS OF GEOMETRY. SUPPLEMENT.BOOK III. OF THE COMPARISON OF SOLIDS. DEFINITIONS.I. Solid is that which has length, breadth, and thickness.II. Similar solid figures are such as are contained by the same nnmberof similar planes similarly situated, and having…
Euclid's Elements · Geometry · Trigonometry
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