Davies, Charles, 1798-1876 · New York and Chicago, A. S. Barnes and company · leaf 124
IX. If a plane cuts two parallel planes, the lines of intersection wilJbe parallel 13 O O K V 123 Of Plane Let the parallel planes MIS andPA be intersected by the planeEH: then will the lines of inter-section EF, GH, be parallel. For, if the lines EF, GH, werenot parallel, they would meet eachother… … THEOREM X. Ij two lines are parallel to a third line, though not in the samaplane with it, they will be parallel to each other. Let the lines AB and CD be eachparallel to the third line EF, thoughnot in the same plane with it: thenwill they be parallel to each other. Foi since EF and CD are…
Geometry · Plane trigonometry
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