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" The circumference of every circle is supposed to be divided into 360 equal parts, called degrees ; and each degree into 60 equal parts, called minutes ; and each minute into 60 equal parts, called seconds ; and these into thirds, &c. "
The First Six Books: Together with the Eleventh and Twelfth - Page 483
by Euclid - 1781 - 520 pages
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The Elements of Euclid, Viz: The Errors, by which Theon, Or Others, Have ...

Robert Simson - Trigonometry - 1775 - 520 pages
...meafure of the angle ABC. II. The circumference of a circle is fuppofed to be divided into H h ' 360 360 equal parts called degrees, and each degree into...60 equal parts called minutes, and each minute into 6e equal parts called feconds, &c. And as many degrees, minutes, feconds, &c as are contained in any...
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The Geometrician: Containing Essays on Plane Geometry, and Trigonometry ...

Benjamin Donne - Geometry, Plane - 1775 - 159 pages
...Semicircle, or 2 Rt. ¿.s, and 90 Degrees a Quadrant, or Rt L. j) each Degree is fuppofed to be divided into 60 equal Parts, called Minutes, and each Minute into 60 equal Parts, called Seconds, &c. Hence it is plain, that in une' qual Circles, as well as in equal, equal Angles are fubtended...
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The Practical Navigator, and Seaman's New Daily Assistant. ...

John Hamilton Moore - Nautical astronomy - 1791 - 296 pages
...ßooth Part of the Circumference of any Circle. All Circles, whether great or fmall, are divided into 360 equal Parts, called Degrees ; and each Degree...Minutes ; and each Minute into 60 equal Parts called Seconds, &c. A Semicircle is 180 Degrees, and a Quadrant contains 90 Degrees. A Right Angle contains...
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A Complete Treatise on Practical Mathematics: Including the Nature and Use ...

John McGregor (teacher of mathematics.) - Mathematics - 1792 - 431 pages
...into right-angled and oblique-angled trigonometry. The circumference of any circle, is divided into 360 equal parts, called degrees, and each degree into...minutes, and each minute into 60 equal parts, called féconds, and fo on. JVi/f, Degrees are frequently marked °, and minutes '. Thus, 30 degrees, 14 minutes,...
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A Treatise of Practical Surveying: Which is Demonstrated from Its First ...

Robert Gibson - Surveying - 1795 - 319 pages
...Radius, as AB cr DE. Fig. 8. 1 8. The Circumference of every Circle is fuppofed to be Divided into 360 equal Parts called Degrees, and each Degree into...Minutes, and each Minute into 60 equal Parts called Seconds, and thefe into Thirds, Fourths, &c. thefe Parts being greater or lefs as the Radius is. 19....
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Trigonometry, Plane and Spherical: With the Construction and Application of ...

Thomas Simpson - Trigonometry - 1799 - 79 pages
...fome affigned number of equal parts. 2. The periphery of every circle is fuppofed to be divided into 360 equal parts, called degrees ; and each degree...and each minute into 60 equal parts, called feconds, or fecond minutes, &c. ' B a 3- Any HK/ 3. Any part AB of the periphery of the circle is called an...
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A Complete System of Practical Arithmetic, with Various Branches in the ...

William Taylor (teacher of the mathematics.) - Arithmetic - 1800 - 519 pages
...called the Radius. 8. The circumference of every circle is divided into 360 equal parts called Degrees ; each degree into 60 equal parts, called Minutes ; and each minute into 60 equal parts, called Seconds, &c. Any part of the the circumference is called an Arch. 9. The Chord of an arch, is a right...
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A Treatise of Algebra: Wherein the Principles are Demonstrated and Applied ...

Thomas Simpson - Algebra - 1800 - 400 pages
...circle is fuppofed to be divided into 360 equal parts, called degrees ; and each degree into 60 cgual parts, called minutes, and each minute into 60 equal parts, called feconds, or fccond minutes, &'c. Any part of the periphery is called an arch, and is ineafured by the number...
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The Elements of Euclid: Also the Book of Euclid's Data ...cor. viz. The ...

Robert Simson - Trigonometry - 1804
...called the meafure of the angle ABC. II. The circumference of a circle is fuppofed to be divided into 360 equal parts called degrees, and each degree into...feconds, &c. as are contained in any arch, of fo many degrees, mia nutes, feconds, &c. is the angle, of which that arch is the meafure, faid to be. CoR....
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A System of Geometry and Trigonometry: Together with a Treatise on Surveying ...

Abel Flint - Geometry - 1804 - 168 pages
...called Semicircles ; as AB or DE. 14. The. Circumference of every Circle is supposed to be Divided into 360 equal parts, called Degrees ; and each Degree...Minutes ; and each Minute into 60 equal parts, called Seconds ; jktl these into Thirds, &c. Ifote. .-Since all Circles are divided into the same number of...
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