Books Books 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 First Six Books: Together with the Eleventh and Twelfth - Page 474
by Euclid - 1781 - 520 pages ## Elements of Geometry and Trigonometry: With Notes

Adrien Marie Legendre - Geometry - 1828 - 346 pages
...calculations, the circumference of the circle is conceived 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. The semicircumference, or the measure of two right angles, contains 180 degrees; the quarter... ## Elements of Geometry: Being Chiefly a Selection from Playfair's Geometry

John Playfair - Geometry - 1829 - 186 pages
...measure of the angle BGC. Mathematicians suppose the circumference of every circle to be divided into 360 equal parts, called degrees, and each degree into...equal parts, called minutes, and each minute into £0 equal parts, called seconds, &c. Hence a right angle, being measured by a quadrant contains 90... ## A System of Geometry and Trigonometry: With a Treatise on Surveying ... in ...

Abel Flint - Surveying - 1830 - 284 pages
...semicircles ; as AB or DE. Fig. 5. 14. The circumference of every circle is supposed to be divided into 360 equal parts, called degrees ; and each degree...minutes; and each minute into 60 equal parts, called seconds ; and these into thirds, &c . NOTE. Since all circles are divided into the same number of degrees,... ## Elements of Surveying: With the Necessary Tables

Charles Davies - Surveying - 1830 - 318 pages
...calculations, the circumference of the 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. 26. As the circumference of a circle may be regarded as a proper measure of angles, having... ## A System of Natural Philosophy: In which the Principles of Mechanics ...

John Lee Comstock - Physics - 1831 - 314 pages
...near the star a. Each of the 12 signs of the zodiac is divided into 30 smaller partSj called degrees; each degree into 60 equal parts, called minutes, and each minute into 60 parts, called seconds. The division of the zodiac into signs, is of very ancient date, each sign having... ## Easy Lessons in Geography and History: Designed for the Use of the Younger ...

Joseph Allen - America - 1832 - 128 pages
...360 equal parts, called degrees, and each degree contains about 09 A miles. Each degree is divided into 60 equal parts, called minutes, and each minute into 60 equal parts, called seconds. Questions for Review. How many degrees are there in the circumference of the earth ? How many... ## A System of Geometry and Trigonometry: With a Treatise on Surveying; in ...

Abel Flint - Geometry - 1835 - 366 pages
...semicircles ; as AB or DE. Fig. 5. 14. The circumference of every circle is supposed to be divided into 360 equal parts, called degrees ; and each degree...minutes ; and each minute into 60 equal parts, called seconds ; and these into thirds, &c. NOTE. Since all circles are divided into the same number of degrees,... ## The Elements of Euclid: Viz. the First Six Books, Together with the Eleventh ...

Euclid - 1835 - 540 pages
...called the measure of the angle ABC. II. The circumference of a circle is supposed to be divided into 360 equal parts called degrees, and each degree into...minutes, and each minute into 60 equal parts called seconds, &c. A degree is marked thus, ° ; a minute thus, ' ; a second thus,"; and so on: for example,... ## On the Connexion of the Physical Sciences

Mary Somerville - Astronomy - 1835 - 532 pages
...the ellipse. NOTE 49. p. 12. Ninety degrees. A circle is divided into 3fiO equal parts, or degrees; each degree into 60 equal parts, called minutes ; and each minute into 60 equal parts, called seconds. It is usual to write these quantities thus, 15° 16' 10'', which means fifteen degrees, sixteen... 