Elements of geometry / from the Latin translation of Commandine. To which is added, a treatise of the nature of arithmetic of logarithms, likewise another of the elements of plain and spherical trigonometry; with a preface ... By Doctor John Keil ... The whole revised ... [with a] preface, by Samuel Cunn.

  • Euclid
Date:
1741
Catalogue details

Licence: Public Domain Mark

Credit: Elements of geometry / from the Latin translation of Commandine. To which is added, a treatise of the nature of arithmetic of logarithms, likewise another of the elements of plain and spherical trigonometry; with a preface ... By Doctor John Keil ... The whole revised ... [with a] preface, by Samuel Cunn. Source: Wellcome Collection.

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    Euclia s Elements. Book I. of, equal between themfelves, each of thefe equal Angles is a Right one, and that Right Line which ftands upon the other, is called a Per¬ pendicular to that whereon it ftands. XL An Obtufe Angle is that which is greater than a Right one. XII. An Acute Angle is that which is lefts than a Right one. XIII. A Perm (or Bound) is that which is the Extre??ie of any thing. XIV. A Figure is that which is contained under one or more Perms. XV. A Circle is a plain Figure, contained under one Line, called the Circumference ; to which all Right Lines, drawn from a certain Point within the Figure, are equal. XVI. And that Point is called the Centre of the Circle. XVII. A Diameter of a Circle is a Right Line drawn through the Centre, and terminated on both Sides by thd Circumference, and divides the Circle into two equal Parts. XVIII. A Semicircle is a Figure contained un¬ der a Diameter, and that Part of the Circum* ference of a Circle, cut off by that Diameter. XIX. A Segment of a Circle is a Figure con¬ tained under a Right Line, and Part of the Circumference of the Circle [which is cut off by that Right Line. ] XX. Right-lined Figures are fuch as are con¬ tained under Right Lines. XXL Phree-fided Figures are fuch as are con¬ tained under three Lines. XXII. Four-fided Figures are fuch as are con¬ tained under four. XXII. Many-fide d Figures are thofe that are contained under ?nore than four Right Lines. XXIV. Of