| John Muller - Mathematics - 1769 - 152 pages
...whatever ratio two arcs have, the angles they fubtend will be in the fame ratio. C NB NB Mathematicians divide the circumference of a circle into 360 equal parts, called degrees, each degree into 60 minutes, and each minute into 60 feconds. Thefe divifions being marked on a femi-circle... | |
| William Johnson - 1860 - 434 pages
...line, and curvilinear when formed by two curved lines. Measurement of Angles. — It is customary to divide the circumference of a circle into 360 equal parts called degrees. Now, if, with the apex of an angle as the centre, we describe an arc extending from leg to leg, the size... | |
| James Smith - 1870 - 634 pages
...circle to its diameter ; hence, if r denote the radius of a circle, its circumference is 2 7r(r)." For all practical purposes we divide the circumference of a circle into 360 equal parts which we call degrees, and these degrees we again divide into 60 equal parts which we call minutes.... | |
| John Maxton - Mechanical drawing - 1871 - 372 pages
...Fig. 92. Fig. 93. Fig. 94." Degrees. — Angles are described as of so many degrees. It is usual to divide the circumference of a circle into 360 equal parts, called degrees ; these again are divided into minutes, and the latter into seconds ; and known by the following signs... | |
| John Maxton - Mechanical drawing - 1922 - 292 pages
...Fig. 92. Fig. 93. Fig. 94. Degrees. — Angles are described as of so many degrees. It is usual to divide the circumference of a circle into 360 equal parts, called degrees ; these again are divided into D minutes, and the latter into seconds ; and known by the following... | |
| |