Excerpt from Euclid's Elements of Geometry: To Which Is Added a Compendium of Algebra, Also a Compendium of Trigonometry The First Book of Euclid gives the definitions, axioms, and postulates, requisite for establishing the Propositions; it treats of right lines, triangles, The Forty-eight Propositions here set before us should be well grounded in the memory of every student, before advancing a step beyond them; at the same time becoming acquainted with the Algebra, as set forth in this publication. The Second Book lays before us the equality between squares and right-angled figures, or squares constructed on the parts of any divided line, 850. 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.