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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.
First lessons in Plane Geometry. Together with an application of them to the ... - Page 173
by Francis Joseph Grund - 1830 - 12 pages

## The Normal Rudiments of Arithmetic: Oral and Written, Designed for Primary ...

Edward Brooks - Arithmetic - 1895 - 248 pages
...from a point within called the centre. 3. For the purpose of measuring angles the circumference is divided into 360 equal parts, called degrees ; each...degree into 60 equal parts, called minutes; each minute into 60 equal parts, called seconds. 4. Any angle at the centre, as BCD, is measured by the arc BD...

## The Normal Standard Arithmetic: By Analysis and Induction, Designed for ...

Edward Brooks - Arithmetic - 1895 - 426 pages
...the circumference is called a quadrant. 241. For the purpose of measuring angles the circumference is divided into 360 equal parts, called degrees ; each...degree into 60 equal parts, called minutes; each minute into 60 equal parts, called seconds. 242. Any angle having its vertex at the centre is measured by...

## Plane Geometry

George D. Pettee - Geometry, Plane - 1896 - 272 pages
....-.theirlimits=J 175. Sen. Both the circumference 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...

## Coal and Metal Miners' Pocketbook of Principles, Rules, Formulas, and Tables ...

International Correspondence Schools - Mining engineering - 1900 - 730 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...

## 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 ; each degree into 60 equal parts, called minutes, and each minute into 60 equal parts, called seconds. For brevity, an angle measured by an arc of 1°...

## Mechanics and Hydrostatics for Beginners

Sidney Luxton Loney - Hydrostatics - 1905 - 332 pages
...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 parts called minutes, and each minute into 60 equal parts called seconds. The symbols used for a degree, a minute, and a...

## A School Geometry, Parts 1-4

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 O from the position...

## Complete Arithmetic, Parts 2 and #3

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 parts called minutes, and each minute into 60 equal parts called seconds. jJ5 of a circumference is called 1 degree of arc....