 | American School (Chicago, Ill.) - 1903 - 426 páginas
...degrees is measured by ^ of the circumference. 185. For accurate measurement each degree is divided into 60 equal parts called minutes and each minute into 60 equal parts called seconds. The symbols of degrees, minutes and seconds are °, ', ", respectively. To express 23 degrees, 47 minutes... | |
 | Wilbur Fisk Nichols - 1903 - 328 páginas
...o'clock, in what time will the hands of a clock be at right angles to each other ? 1. For convenience, every circle is supposed to be divided into 360 equal parts called degrees. 2. By means of an instrument called a protractor any angle can be measured. 3. From cardboard cut out... | |
 | Walter Nelson Bush, John Bernard Clarke - 1905 - 378 páginas
...theorem may be stated thus : A central angle is measured by its intercepted arc. The circumference is divided into 360 equal parts, called degrees ; each...and each minute into 60 equal parts, called seconds. For brevity, an angle measured by an arc of 1° is called an angle of 1° ; etc. NOTE. — This division... | |
 | John Marvin Colaw, Frank Williamson Duke - 1906 - 408 páginas
...passing around the earth on its surface ? 444. In measuring circumferences, each degree is divided in 60 equal parts, called minutes, and each minute into 60 equal parts, called seconds. In this measure, degrees, minutes, and seconds are written with symbols. Thus, 3 degrees, 25 minutes,... | |
 | Matthew Fontaine Maury - 1906 - 246 páginas
...equally ? which unequally ? Examine the edges of the pieces ; which are great circles ? Small circles ? Every circle is supposed to be divided into 360 equal parts called degrees, marked (°). Each degree is divided into tiO minutes, marked ('), and each minute into 60 seconds,... | |
 | Sidney Luxton Loney - 1905 - 332 páginas
...inconvenient unit of measurement on account of its size. We therefore subdivide a right angle into 90 equal parts called degrees, each degree into 60 equal...and each minute into 60 equal parts called seconds. The symbols used for a degree, a minute, and a second are 1°, 1', and 1". Thus 10° 11' 12" means... | |
 | 1907 - 710 páginas
...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 páginas
...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 páginas
...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 - 1909 - 312 páginas
...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... | |
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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 ; and each minute into 60 equal parts, called seconds. 
