Definition:Angle/Types
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Definition
Angles can be divided into categories:
Zero Angle
The zero angle is an angle the measure of which is $0$ regardless of the unit of measurement.
Acute Angle
An acute angle is an angle which has a measure between that of a right angle and that of a zero angle.
Right Angle
A right angle is an angle that is equal to half of a straight angle.
Obtuse Angle
An obtuse angle is an angle which has a measurement between those of a right angle and a straight angle.
Straight Angle
A straight angle is defined to be the angle equal to one half of a complete turn.
Reflex Angle
A reflex angle is an angle which has a measure between that of a straight angle and that of a full angle.
Full Angle
A full angle is an angle equivalent to one full rotation.
It is possible to consider angles outside the range $\closedint {0 \degrees} {360 \degrees}$, that is, $\closedint 0 {2 \pi}$.
However, in geometric contexts it is usually preferable to convert these to angles inside this range by adding or subtracting multiples of a full angle.