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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.
Elements of Plane Trigonometry: And Their Application to the Measurement of ... - Página 14
por William Frothingham Bradbury - 1864
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## Robinson's New Practical Arithmetic for Common Schools and Academies

Horatio Nelson Robinson - 1892 - 416 páginas
...times are 4 bu. 3 pk. 2 qt. contained in 336 bu. 3 pk. 4 qt. ? Ans. 70 times. LONGITUDE AND TIME. 224. Every circle is supposed to be divided into 360 equal parts, called degrees. Since the sun appears to pass from east to west round the earth, or through 360°, once in every 24...
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## Introductory Modern Geometry of Point, Ray, and Circle: Part 1, Parte1

William Benjamin Smith - 1892 - 143 páginas
...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 minutce primae), each minute into 60 equal seconds (partes minutae secunJiz), denoted...
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## Introductory Modern Geometry of Point, Ray, and Circle

William Benjamin Smith - 1892 - 297 páginas
...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...
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## Mensuration

William Shaffer Hall - 1893 - 62 páginas
...convenient unit is a right angle. The right angle is divided into 90 equal parts called degrees, and each degree into 60 equal parts called minutes, and each minute into 60 equal parts called seconds. Angles at the centre of a circle have the same ratio as the arcs which are subtended by them (Ww. Geom.,...
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## New Elementary Arithmetic: Embracing Mental and Written Exercises, for Beginners

Henry Bartlett Maglathlin - 1893 - 224 páginas
...circle is any straight line drawn through the center, and terminated by the circumference, as AE. 173. The circumference of every circle is supposed to be divided into 360 equal parts, called Degrees. A Quadrant is a fourth of a circumference, or an are of 90 degrees, as AB. 174. The Angle ACB, whose...
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## New Common School Question Book: Comprising Questions and Answers on All ...

Asa Hollister Craig - 1897 - 524 páginas
...circle. 88. The standard unit of time is the day. This is determined by the revolution of the earth. 91. Every circle is supposed to be divided into 360 equal parts called degrees. As the earih makes its revolution once in 21 hours, the 24 hours must equal 3 ' i0 P , or one hour...
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## Introductory Modern Geometry of Point, Ray, and Circle

William Benjamin Smith - 1893 - 297 páginas
...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...
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## The Elementary Arithmetic: Oral and Written

Albert Newton Raub - 1894 - 192 páginas
...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...and each minute into 60 equal parts, called seconds. TABLE. 60 seconds (") =1 minute, (' ). 60 minutes = 1 degree, ( ° ). 30 degrees = 1 sign, s. 12 signs...
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## Elementary Synthetic Geometry of the Point, Line and Circle in the Plane

Nathan Fellowes Dupuis - 1894 - 294 páginas
...practical purposes the right angle is divided into 90 equal parts called degrees ; each degree is divided into 60 equal parts called minutes ; and each minute into 60 equal parts called seconds. 20 seconds and six-sevenths of a second, follows :— 51° 25' 42f". This is denoted as 42°. Theorem...
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## Elements of Mechanical Drawing

Gardner Chace Anthony - 1894 - 98 páginas
...circle is called a semi-circle, as the area ABEG D. A Quadrant is the fourth part of a circle, as BC G. Every circle is supposed to be divided into 360 equal parts, called degrees, which are used as a measure of angles; therefore the arc of a semi-circle is equal to 180°. The arc...
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