 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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