For instance seven and a half degrees is now usually written 7.5°. Parts of a degree are now usually referred to decimally. The division of degrees into minutes and seconds of angle is analogous to the division of hours into minutes and seconds of time. Each minute is further divided into 60 equal parts called seconds, and, for instance, 2 degrees 5 minutes 30 seconds is written 2° 5' 30". So seven and a half degrees can be called 7 degrees and 30 minutes, written 7° 30'. Each degree is divided into 60 equal parts called minutes. For the time being, we’ll only consider angles between 0° and 360°, but later, in the section on trigonometric functions, we’ll consider angles greater than 360° and negative angles.ĭegrees may be further divided into minutes and seconds, but that division is not as universal as it used to be. A circle is divided into 360 equal degrees, so that a right angle is 90°. The more familiar unit of measurement is that of degrees. There are two commonly used units of measurement for angles.
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