Excerpt from Plane and Solid Geometry Thus, let the upright surface abc'd (fig. 3) move to the right to the position efgh, the points A, B, C, and D gener ating the lines ae, bf, cg, and dh, respectively. The lines ab, bc, CD, and DA will generate the surfaces af, bg, ch, and de, respectively. The surface abc'd will generate the solid ag. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.