Excerpt from Elements of Plane and Solid Geometry Most persons do not possess, and do not easily acquire, the power of abstraction requisite for apprehending the Geometri cal conceptions, and for keeping in mind the successive steps of a continuous argument. Hence, with a very large proportion of beginners in Geometry, it depends mainly upon the form in which the subject is presented whether they pursue the study with indifference, not to say aversion, or with increasing interest and pleasure. 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.

Excerpt from Wentworth's Plane Geometry With equal truth these words may be applied to the Geome try written by George A. Wentworth. For a generation it has been the leading textbook on the subject in America. It set a standard for usability that every subsequent writer upon geometry has tried to follow, and the number of pupils who have testified to its excellence has run well into the millions. 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.

Excerpt from Solid Geometry While rigorous proofs have claimed first attention, still every effort has been made to bring the proofs within the comprehension of students who read the subject for the first time. Woodcuts are employed to illustrate the definitions, and are placed by the side of the ordinary figures used in demonstrations. It is expected that these woodcuts will be of great value in helping the student to gain clear conceptions of the figures and to cultivate a correct geometrical imagination. Book IX, Conic Sections, has been carefully revised, and new figures have been substituted for the old ones. The excellent cuts of the Solid Geometry are largely due to Miss M. Gertrude Cross, of Boston, Mass. 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.

Excerpt from Plane and Solid Geometry Many of the exercises at the foot of the page require the student to infer the truth involved in the relations given. The interrogative form is employed for the purpose of compelling the student to obtain the ideas for himself, and the answers he must give to the questions furnish an admirable training in accuracy of expression. A great abundance of undemonstrated theorems and of unsolved prob lems is supplied, and teachers will find them quite numerous enough for the needs of any class. The demonstration of original theorems and the solution of original problems are of so great consequence in developing the power to reason that every teacher should insist upon such work. Much aid in originating demonstrations may be obtained from the Summaries which follow each of the first six books. These summaries are not collections of propositions that have been demonstrated, but are rather groups of the truths established in the book to which they are appended. If the student makes himself thoroughly acquainted with them, much of the difficulty experienced in demonstrating original theorems, in solving problems, and in determining loci will be removed. A very small proportion of those who study elementary geometry expect to become mathematicians in any broad sense of the term, and so geometry must serve to give them almost the only training they will get in formal and logical argument in secondary schools and in colleges. For this reason mathematical elegance in demonstrations and in solu tions has often been sacrificed in the interest of clear and simple steps, even though such a plan has required some expansion of the text. Ele gant demonstrations are appreciated by mathematicians, but training in formal deductive reasoning is of more consequence to most students. 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.