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The circumference of every circle is supposed to be divided into 360 equal parts called degrees, each degree into 60 equal parts called minutes, each minute into 60 equal parts called seconds.
Elements of Surveying: With the Necessary Tables - Page 21
by Charles Davies - 1830 - 306 pages

## Elements of Geometry and Trigonometry: With Applications in Mensuration

Charles Davies - Geometry - 1855 - 336 pages
...GEOMETRYDefinitions 28 The circumference of a 'circle is used for the measurement of angles- For this purpose it is divided into 360 equal parts called degrees, each degree into 60 equal parts called ninutes, and each minute into 60 equal parts called secondsThe degrees, minutes, and seconds are marked...

## Mathematical Dictionary and Cyclopedia of Mathematical Science: Comprising ...

Charles Davies, William Guy Peck - Mathematics - 1857 - 608 pages
...purposes of trigonometrical computation, each quadrant or right angle is supposed to be divided into 90 equal parts, called degrees ; each degree into 60 equal parts, called minutes ; each minute into 60 equal parts, called seconds ; so that a right angle contains 32400 seconds. The...

## Mensuration and Practical Geometry: Containing Tables of Weights and ...

Charles Haynes Haswell - Measurement - 1858 - 350 pages
...without cutting it. A Cotangent is the tangent of the complement of the arc. The Circumference of every circle is supposed to be divided into 360 equal parts, called Degrees ; each degree into 60 Minutes, and each minute into 60 Seconds, and so on. The Complement of an angle is what remains after...

## Bourdon's Arithmetic: Containing a Discussion of the Theory of Numbers

Bourdon (M., Louis Pierre Marie) - Arithmetic - 1858 - 262 pages
...point within, called the centre. In all the scientific works in this country, the circumference is divided into 360 equal parts, called degrees (°) ; each degree into 60 equal parts, called minutes (,); each minute into 60 equal parts, called seconds ("). This is called the sexagesimal division....

## A Treatise on Plane and Spherical Trigonometry, and on Trigonometrical ...

John Hymers - Logarithms - 1858 - 292 pages
...of being determined geometrically, and furnishes an invariable standard of angular measure) into 90 equal parts called degrees, each degree into 60 equal parts called minutes, each minute into 60 equal parts called seconds; then an angle is expressed by the number of degrees,...

## Carpentry Made Easy: Or, The Science and Art of Framing, on a New and ...

William E. Bell - Bridge building - 1857 - 254 pages
...a tangent — O is the point of contact. 46. The circumference of every circle is measured by being supposed to be divided into 360 equal parts, called degrees; each degree contains GO minutes, and each minute 60 seconds. Degrees, minutes, and seconds, are desig uated respectively...

## A Treatise on Practical Mensuration

Anthony Nesbit - Measurement - 1859 - 494 pages
...A sector is any part of a circle, bounded \'y an arc and two radii. 47. The circumference of every circle is supposed to be divided into 360 equal parts,...equal parts, called minutes ; and each minute into GO equal parts, called seconds. 48. The arc of a quadrant contains 90 degrees, which is the measure...

## Tables of Logarithms of Numbers and of Sines and Tangents for Every Ten ...

Elias Loomis - Logarithms - 1859 - 372 pages
...plane triangles; Spherical Trigonometry treats of spherical triangles. (19.) The circumference of every circle is supposed to be divided into 360 equal parts, called degrees ; each degree into 60 minutes, and each minute into 60 seconds. Degrees, minutes, and seconds are designated by the characters...