The circumference of every circle is supposed to be divided into 360 equal parts, called degrees ; each degree into 60 equal parts, called minutes ; and each minute into 60 equal parts, called seconds. An Elementary Geometry and Trigonometry - Page 11by William Frothingham Bradbury - 1873 - 238 pagesFull view - About this book
| Astronomy - 1907 - 710 pages
...measuring arc is a part is divided into 360 equal parts, called degrees; each degree is subdivided **into 60 equal parts, called minutes; and each minute into 60 equal parts, called seconds.** The magnitude of an angle is then expressed by the number of degrees, minutes, and seconds that its... | |
| William A. Radford - 1907 - 332 pages
...divided by mathematicians into 360 equal parts, called degrees ; each degree being again subdivided **into 60 equal parts, called minutes, and each minute into 60 equal parts called seconds.** Hence, it follows that the arc of a quarter circle or quadrant includes 90 degrees; that is, one-fourth... | |
| Henry Sinclair Hall - 1908 - 286 pages
...which it is perpendicular to AB. (ii) All right angles are equal. A right angle is divided into 90 **equal parts called degrees (°) ; each degree into 60 equal parts called minutes** (') ; each minute into 60 equal parts called seconds ("). In the above figure, if OC revolves about... | |
| George E. Mercer - Arithmetic - 1909 - 312 pages
...circumference is an arc. A to B and B to C are arcs. The circumference of every circle is divided into 300 **equal parts called degrees, each degree into 60 equal...and each minute into 60 equal parts called seconds.** jJ5 of a circumference is called 1 degree of arc. J of a circumference, or 90 degrees, is called a... | |
| Eugene Randolph Smith - Geometry, Plane - 1909 - 204 pages
...numerical calculations, a perigon is divided into 360 equal parts, called degrees; each degree is divided **into 60 equal parts called minutes, and each minute into 60 equal parts called seconds.** 73. How many degrees are there in an interior angle of a regular polygon of 15 sides? of n-sides? 74.... | |
| 1912 - 552 pages
...degrees, ie, it is =i of a circumference. In order to obtain accurate measurements each degree is divided **into 60 equal parts called minutes and each minute into 60 equal parts called seconds.** f65\ {BO /OS F1 g - 6L Angular Measurement SOLIDS A solid has three dimensions—length, breadth, and... | |
| William A. Radford, Alfred Sidney Johnson - Architecture - 1909 - 384 pages
...divided by mathematicians into 360 equal parts, called degrees ; each degree being again subdivided **into 60 equal parts, called minutes, and each minute into 60 equal parts called seconds.** Hence, it follows that the arc of a quarter circle or quadrant includes 90 degrees; that is, one-fourth... | |
| Eugene Randolph Smith - Geometry, Plane - 1909 - 424 pages
...How many sides has the polygon each of whose interior angles is six sevenths of a straight angle ? **60 equal parts called minutes, and each minute into 60 equal parts called seconds.** 73. How many degrees are there in an interior angle of a regular polygon of 15 sides? of n-sides? 74.... | |
| George Wentworth, David Eugene Smith - Arithmetic - 1911 - 316 pages
...in the circumference is called a radius. A radius is equal to half a diameter. 186. Measuring Arcs. **The circumference of every circle is divided into 360 equal parts called degrees.** Corresponding to every arc, like .47? in the figure, is an angle at the center, A OH. Therefore to... | |
| John William Hopkins, Patrick Healy Underwood - Arithmetic - 1912 - 406 pages
...units. The whole circumference is divided into 360 equal parts called degrees. Each degree is divided **into 60 equal parts called minutes, and each minute into 60 equal parts called seconds.** As one degree is ^^ of any circumference, a degree on one circle is not of the same size as a degree... | |
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