Excerpt from Primary Geometry: With Simple and Practical Examples in Plane and Projection Drawing, and Suited to All BeginnersWe have also, perhaps, all heard of Arithmetic, Algebra, and Geometry as branches of Mathematics. We think of Arithmetic as ciphering with figures, or working with figures to find numbers. If we know any thing at all of Algebra, perhaps we think of it as ciphering with letters instead of figures, or with a mixture of letters and figures, in order to work out some kinds of examples which cannot be done with figures alone.We may also have an idea that Geometry is quite different from Arithmetic or Algebra, and that it is a kind of study of lines and angles, and of figures and bodies bounded or marked by lines and angles.All these ideas are very good so far as they go. But let us get a little fuller and clearer idea of some of these subjects. First of all, we shall need to know what quantity means.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis 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.