Books Books 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 11
by William Frothingham Bradbury - 1873 - 238 pages George Albert Wentworth - Arithmetic - 1898 - 424 pages
...by OA. The angle A OB is such a part of the angular magnitude about 0 as AB is of the circumference. The circumference of every circle is divided into 360 equal parts, called degrees (arc-degrees), and corresponding to every one of these equal parts is an angle at the centre of the... George Albert Wentworth - Arithmetic - 1898 - 424 pages
...by (M. The angle A OB is such a part of the angular magnitude about O as AB is of the circumference. The circumference of every circle is divided into 360 equal parts, called degrees (arc-degrees), and corresponding to every one of these equal parts is an angle at the centre of the... ## Coal and Metal Miners' Pocketbook of Principles, Rules, Formulas, and Tables ...

International Correspondence Schools - Mining engineering - 1900 - 728 pages
...circumference being at the vertex of the angle. For measuring angles, the circumference is divided into :i60 equal parts. called degrees; each degree into 60 equal parts called minutes. A quadrant is one-fourth the circumference of a circle, or 90°. The complement of an arc is 90° minus... John Marvin Colaw, John Kelley Elkwood - Arithmetic - 1900 - 450 pages
...formed. Thus, the arc DE is the measure of the angle DCE. 337. In measuring angles, the circumference is divided into 360 equal parts, called degrees ; each degree into 60 parts, called minutes ; and each minute into 60 parts, called seconds. 1. The length of a degree varies.... ## Heath's Complete Practical Arithmetic

Charles Edward White - Arithmetic - 1901 - 472 pages
...line through the centre of a circle terminating at the circumference is the * cime. Diameter. 203. The circumference of every circle is divided into...360 equal parts called Degrees, each degree into 60 parts called Minutes, and each minute into 60 parts called Seconds. 204. An Angle is the difference... ## Elementary Algebra and Mensuration: Instruction Paper

American School (Lansing, Ill.) - Algebra - 1902 - 80 pages
...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 ('ailed seconds. The symbols of degrees, minutes and seconds are °, ', ", respectively. To express... ## Mathematics

American School (Chicago, Ill.) - Engineering - 1903 - 428 pages
...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... ## The Elements of Geometry

Walter Nelson Bush, John Bernard Clarke - Geometry - 1905 - 378 pages
...theorem may be stated thus : A central angle is measured by its intercepted arc. The circumference is divided into 360 equal parts, called degrees ;...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... ## School Arithmetic: Practical Book

John Marvin Colaw, Frank Williamson Duke - Arithmetic - 1906 - 408 pages
...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,... 