Excerpt from The Elements of Solid Geometry In Section III. I have treated of Dihedral and Solid Angles, and in Section IV. Of Polyhedra, and in particular of the five Regular Solids, with the definitions and a summary of the leading characteristics of the Prism, Cylinder, Pyramid, ' Cone, and Sphere. In Section V. The Volumes of Solids are considered, and the usual rules or formulae for the numerical measures of volumes in cubic units deduced. To this Section I have added an Appendix on Symmetry, which I h0pe will be useful in assisting the student to clearer conceptions of figures and their relations in solid space. A short word has long been wanted for the decasyllabic rectangular parallelepiped: I am sanguine that the word cuboid, which I have here introduced, will meet with acceptance from mathematicians. 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.