The new royal road to geometry, and familiar introduction to the mathematics. Part I. Elements of Geometry Abridged. Containing the whole Substance of Euclid's first six, the eleventh and twelfth Books; with many other, useful and valuable, Theorems; treated in the most brief, easy, and intelligent manner; being an attempt to render the knowledge of that most useful and necessary Science more general. With Notes interspersed, critical, explanatory, and instructive. By Thomas Malton, Sen. To which is annexed, an Appendix, on the Theory of Mensuration of Superficies and Solids, as deduced from the Elements; with some Properties of Ellipses demonstrated [electronic resource].