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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.
A Treatise of Plane and Spherical Trigonometry: In Theory and Practice ... - Page ix
by Francis Nichols - 1811 - 128 pages

## Introductory Modern Geometry of Point, Ray, and Circle

William Benjamin Smith - Geometry, Modern - 1892 - 314 pages
...straight angle? In a right angle ? HISTORICAL NOTE. — For purposes of computation the round angle is divided into 360 equal parts called degrees, each degree into 60 equal minutes (partes minutes primae), each minute into 60 equal seconds (partes minutse secundci), denoted...

## Introductory Modern Geometry of Point, Ray, and Circle

William Benjamin Smith - Geometry, Modern - 1893 - 330 pages
...straight angle? In a right angle ? HISTORICAL NOTE. — For purposes of computation the round angle is divided into 360 equal parts called degrees, each degree into 60 equal minutes (partes minutte primse), each minute into 60 equal seconds (partes minutse secundtz), denoted...

## The Elementary Arithmetic: Oral and Written

Albert Newton Raub - Arithmetic - 1894 - 200 pages
...the centre and limited by the circumference, as AD, is called a Diameter. 129. Every 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. TABLE. 60 seconds (") =1 minute, (' ). 60 minutes...

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

Edward Brooks - Arithmetic - 1895 - 424 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...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 the arc...

## 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...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 included...

## A Complete Arithmetic: With Oral and Written Exercises

George Washington Hull - Arithmetic - 1895 - 404 pages
...quadrant. An Arc is any part of a circumference. For convenience of measuring the circumference is divided into 360 equal parts, called degrees ; each...60 equal parts, called minutes ; each minute into 60 equal parts, called seconds. TABLE. 60 seconds (") = 1 minute, '. 60 minutes = 1 degree, °. 360...

## 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...

## Self Culture; a Monthly Devoted to the Interests of the Home University League

Edward Cornelius Toune, Graeme Mercer Adam - 1897 - 692 pages
...in fact, measured in this way, that is, on the circumference of a circle. A circle is conceived to be divided into 360 equal parts, called degrees ; each degree into 60 minutes ; each minute into 60 seconds. Thus, when you have swung this strip of paper one-twelfth of...