# Answer to Question #279 in Geometry for Jessy

Question #279
In what units are angles measured? What instrument is used for measurement? Explain how the measurement is made.
1
2010-06-09T12:46:12-0400
There are several units used to measure angles. Among these units degree and radian are by far the most common.

Degree, denoted by a small superscript circle (&deg;), is 1/360 of a full circle, so one full circle is 360&deg;. An advantage of this old sexagesimal subunit is that many angles common in simple geometry are measured as a whole number of degrees. Fractions of a degree may be written in normal decimal notation (e.g. 3.5&deg; for three and a half degrees), but the following sexagesimal subunits of the &quot;degree-minute-second&quot; system are also in use, especially for geographical coordinates, in astronomy and ballistics.

Angles are measured with a tool called a protractor. Step-by-step instructions for measuring:

Step 1. Find the center hole on the straight edge of the protractor.
Step 2. Place the hole over the vertex, or point, of the angle you wish to measure.
Step 3. Line up the zero on the straight edge of the protractor with one of the sides of the angle.
Step 4. Find the point where the second side of the angle intersects the curved edge of the protractor.
Step 5. Read the number that is written on the protractor at the point of intersection. This is the measure of the angle in degrees.

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