CIRCULAR MEASURE.
| 60 | seconds (″) | make | 1 minute (′). |
| 60 | minutes | „ | 1 degree (°). |
| 360 | degrees | „ | 1 circum. (C.). |
The circumference of every circle whatever, is supposed to be divided into 360 equal parts, called degrees.
A degree is 1⁄360 of the circumference of any circle, small or large.
A quadrant is a fourth of a circumference, or an arc of 90 degrees.
A degree is divided into 60 parts called minutes, expressed by the sign (′), and each minute is divided into 60 seconds, expressed by (″); so that the circumference of any circle contains 21,600 minutes, or 1,296,000 seconds.