The Lesson
Degrees are a unit of measurement of an angle. There are 360 degrees in a full rotation.Dictionary Definition
The Oxford English Dictionary defines a degree as "a unit of measurement of angles or circular arcs, being an angle equal to the 90^{th} part of a right angle, or an arc equal to the 360^{th} part of the circumference of a circle (which subtends this angle at the centre)."A Real Example of Degrees
An angle measured in degrees is written as number followed by the degree symbol °:This is 90° (said as "90 degrees").
360 Degrees in a Circle
There are 360 degrees in a full rotation (a circle). One degree is ^{1}⁄_{360}^{th} of a circle.How to Measure an Angle in Degrees
The number of degrees in an angle can be measured directly using a protractor:Alternatively, geometry and trigonometry can be used to find angles.
Important Angles in Degrees

90° is a right angle, a quarter of a rotation.

180° is a straight angle, a half of a rotation.

270° is three quarters of a rotation.

360° is a full angle, a whole rotation.