The first six books of the elements of Euclid : with a commentary and geometrical exercises ; to which are annexed a treatise on solid geometry, and short essays on ancient geometrical analysis, and the theory of transversals (1861)
Lardner, Dionysius, 1793-1859 · London : Print. for Taylor and Walton · leaf 262
be bisected bythe line A D. Take any distance A E from the vertexA upon the side A B, and take from thepoint E another space E F equal to A E. From the point E draw astraight line parallel to A C. This line will intersect A D in somepoint G. Draw a straight line through F and G, and produce it… … BOOK II. Of Solid Figures which are bounded by Planes* (63) Since three planes are necessary to form a solid angle, it isevident that they cannot completely enclose a solid space. There willbe in one direction a void which cannot be closed without one additionalplane at least. Hence it appears,…
Geometry
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