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" The circumference of every circle is supposed to be divided into 360 equal parts, called degrees ; and each degree into 60 equal parts, called minutes ; and each minute into 60 equal parts, called seconds ; and these into thirds, &c. "
The Theory and Practice of Surveying: Containing All the Instructions ... - Σελίδα 45
των Robert Gibson - 1821 - 544 σελίδες
Πλήρης προβολή - Σχετικά με αυτό το βιβλίο

Smith's Illustrated Astronomy: Designed for the Use of the Public Or Common ...

Asa Smith - 1868 - 79 σελίδες
...The circumference of every circle ¡в supposed to be divided into and equal parts, called degrees ; each degree into 60 equal parts, called minutes ; and each minute into 60 equal parts, called seconds. Circumpolar Start.— Those stars which revolve around the pole without...

Astronomy Without a Telescope: Being a Guide-book to the Visible Heavens ...

1869 - 104 σελίδες
...formed by straight lines, from stars or points, meeting at the eye of the observer. For this purpose the circle is supposed to be divided into 360 equal parts, called Degrees, and each of these degrees into 60 equal parts called Minutes, and each minute into 00 equal seconds. A quarter...

A complete treatise on practical land-surveying

Anthony Nesbit - 1870
...circumference, which is everywhere equidistant from a certain point within it, called the centre. 39. 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 Geometry and Trigonometry: With Applications in Mensuration

Charles Davies - 1870 - 319 σελίδες
...the six parts is given. 21. For the purpose of trigonometrical calculation, the circumference of the circle is supposed to be divided into 360 equal parts, called degrees ; each degree is supposed to be divided into 60 equal parts, called minutes ; and each minute into...

Elements of Geometry, Conic Sections, and Plane Trigonometry

Elias Loomis - 1871 - 58 σελίδες
...Trigonometry treats of plane triangles; Spherical Trigonometry treats of spherical triangles. (19.) The circumference of every circle is supposed to be divided into 360 equal parts, called degrees ; each degree into 60 minutes, and each minute into 60 seconds. Degrees, minutes, and seconds are designated...

New Elementary Arithmetic, Embracing Mental and Written Exercises, for ...

Henry Bartlett Maglathlin - 1872
...circle is any straight line drawn through the center, and terminated by the circumference, as AE. 105. The circumference of every circle is supposed to be divided into 360 equal parts, called Degrees. BISO* 270° What is a Circle ? The Circumference of a circle ? What is an Arc of a cirele ? A Diameter...

First book of mathematics

Hugo Reid - 1872 - 124 σελίδες
...two circumferences would exactly coincide. Division of the Circumference. 34. The circumference of a circle is supposed to be divided into 360 equal parts, called degrees, and marked °. Each degree is divided into 60 equal parts, called -minutes, and marked '. Each minute is...

An Elementary Geometry and Trigonometry

William Frothingham Bradbury - 1872 - 238 σελίδες
...triangles. 17. The circumference of every circle is dividad into 360 equal parts, called degrees ( ° ), each degree into 60 equal parts, called minutes ( ' ), and each minute into 60 equal parts, called seconds ( " ). 18. As angles at the centre valy as their arcs, or arcs as their...

The Quadrature of the Circle: The Square Root of Two, and the Right-angled ...

William Alexander Myers - 1873 - 164 σελίδες
...treats of plane triangles ; spherical trigonometry treats of spherical triangles. The circumference of a circle is supposed to be divided into 360 equal parts, called degrees; each degree into 60 minutes, and each minute into 60 seconds. Degrees, minutes, and seconds are designated...

The American House-carpenter: A Treatise on the Art of Building, and ...

Robert Griffith Hatfield - 1874 - 444 σελίδες
...abd, (see note to Art. 27,) theii each of the two angles is called a right angle. 131. — Definition. The circumference of every circle is supposed to be divided into 360 equal parts, called degrees ; hence a semi-circle contains 180 degrees, a quadrant 90, &c. Fig. 90. 132. — Definition. The measure...




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