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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 Theory and Practice of Surveying: Containing All the Instructions ... - Σελίδα 45
των Robert Gibson - 1821 - 544 σελίδες
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## New Elementary Arithmetic: Embracing Mental and Written Exercises, for Beginners

Henry Bartlett Maglathlin - 1893 - 224 σελίδες
...circle is any straight line drawn through the center, and terminated by the circumference, as AE. 173. The circumference of every circle is supposed to be divided into 360 equal parts, called Degrees. A Quadrant is a fourth of a circumference, or an are of 90 degrees, as AB. 174. The Angle ACB, whose...

## New Common School Question Book: Comprising Questions and Answers on All ...

Asa Hollister Craig - 1897 - 524 σελίδες
...circle. 88. The standard unit of time is the day. This is determined by the revolution of the earth. 91. Every circle is supposed to be divided into 360 equal parts called degrees. As the earih makes its revolution once in 21 hours, the 24 hours must equal 3 ' i0 P , or one hour...

## Elements of Mechanical Drawing

Gardner Chace Anthony - 1894 - 98 σελίδες
...circle is called a semi-circle, as the area ABEG D. A Quadrant is the fourth part of a circle, as BC G. Every circle is supposed to be divided into 360 equal parts, called degrees, which are used as a measure of angles; therefore the arc of a semi-circle is equal to 180°. The arc...

## The Elementary Arithmetic: Oral and Written

Albert Newton Raub - 1894 - 192 σελίδες
...AD, is called a Diameter. 129. Every circumference 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. TABLE. 60 seconds (") =1 minute, (' ). 60 minutes = 1 degree, ( °...

## The American House Carpenter: A Treatise on the Art of Building : Comprising ...

Robert Griffith Hatfield - 1895 - 685 σελίδες
...499, obtuse angle)— then each of the two angles is called a right angle. 327. — Definition. — The circumference of every circle is supposed to be divided into 360 equal parts, called degrees ; hence a semicircle contains 180 degrees, a quadrant 90, etc. CBD FIG. 250. 328. — Definition. —...

## Plane Geometry

George D. Pettee - 1896 - 253 σελίδες
...of a circle and the angular space about the centre are divided into 360 equal parts called degrees, each degree into 60 equal parts called minutes, and each minute into CO equal parts called seconds. Since central angles vary as their intercepted arcs, any central angle...

## First Principles of Mechanical and Engineering Drawing

H. Holt-Butterfill - 1897 - 211 σελίδες
...is a quadrant, and one half of it a semi-circle. For the measurement of angles, arcs, chords, etc., the circumference of every circle is supposed to be divided into 360 equal parts called degrees, which are indicated when speaking of them by attaching a small circle to the right of the number stated...

## The Elements of Mechanical Engineering, Τόμος 1

1897
...the unknown parts from the given parts is called the solution of the triangle. 741. In Trigonometry, the circumference of every circle is supposed to be divided into 360 equal parts, called degrees ; every degree is subdivided into GO equal parts, called minutes, and every minute is again divided...

## Graded Lessons in Arithmetic: Book VII

Wilbur Fisk Nichols - 1898
...each flower-bed ? For all the flower-beds? For the lawn? MEASUREMENT OF ANGLES. 1. For convenience, every circle is supposed to be divided into 360 equal parts called degrees. 2. Вy means of an instrument called a protractor any angle can be measured. 3. From cardboard cut...

## Arithmetic, algebra, logarithms, geometry and trigonometry, elementary ...

...the unknown parts from the given parts is called the solution of the triangle. 78. In trigonometry, the circumference of every circle is supposed to be divided into 360 equal parts, called degrees ; every degree is subdivided into 60 equal parts, called minutes; and every minute is again divided...