# Angular unit

**angular measurementsangular**

Throughout history, angles have been measured in many different units.wikipedia

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### Minute and second of arc

**masarcsecondarc second**

Subdivisions of the degree are minute (symbol ', 1' = 1/60°) and second {symbol ", 1" = 1/3600°}.

A minute of arc, arcminute (arcmin), arc minute, or minute arc is a unit of angular measurement equal to 1⁄60 of one degree.

### Shot grouping

**groupinggroupingsgroup of shots**

Often that measurement is converted into angular measurements, such as milliradians (mils) or minutes of angle (MOAs), which expresses the size of shot spreads regardless of the target distance.

### Red dot sight

**red dotred dot sightsreflex sight**

Red dot sight reticle sizes are measured in milliradians (mrad or mil) and minutes of angle (moa), which both are angular measurements, making them handy units to use in ballistics.

### Measure (mathematics)

**measuremeasure theorymeasurable**

Throughout history, angles have been measured in many different units.

### Degree (angle)

**°degreesdegree**

The most contemporary units are the degree and radian (rad), but many others have been used throughout history.

### Radian

**radiansradmicroradian**

The most contemporary units are the degree and radian (rad), but many others have been used throughout history.

### History of mathematics

**historian of mathematicsmathematicshistory**

The most contemporary units are the degree and radian (rad), but many others have been used throughout history.

### Turn (geometry)

**turnturnsrevolution**

In some contexts, such as identifying a point on a circle or describing the orientation of an object in two dimensions relative to a reference orientation, angles that differ by an exact multiple of a full turn are effectively equivalent.

### Spiral

**spiralswhorlspiral patterns**

In other contexts, such as identifying a point on a spiral curve or describing the cumulative rotation of an object in two dimensions relative to a reference orientation, angles that differ by a non-zero multiple of a full turn are not equivalent.

### Theta

**ΘGreek letter ThetaΘ**

In order to measure an angle θ, a circular arc centered at the vertex of the angle is drawn, e.g. with a pair of compasses.

### Arc (geometry)

**arccircular arcarcs**

In order to measure an angle θ, a circular arc centered at the vertex of the angle is drawn, e.g. with a pair of compasses.

### Compass (drawing tool)

**compasscompassesdrafting compass**

In order to measure an angle θ, a circular arc centered at the vertex of the angle is drawn, e.g. with a pair of compasses.

### Circumference

**circumferentialgirthcircumferential line**

One turn, for which θ = n units, corresponds to an arc equal in length to the circle's circumference, which is 2

### Unit of measurement

**unitunits of measurementunits**

Throughout history, angles have been measured in many different units.

### International System of Units

**SISI unitsSI unit**

The radian is the derived quantity of angular measurement in the SI system.

### Dimensionless quantity

**dimensionlessdimensionless numberdimensionless quantities**

By definition, it is dimensionless, though it may be specified as rad to avoid ambiguity.

### Degree symbol

**°degreedegree sign**

Angles measured in degrees, are shown with the symbol °.

### Mathematical constant

**constantconstantsmathematical constants**

### Euclid's Elements

**ElementsEuclid's ''ElementsEuclid**

### Eratosthenes

**Eratosthenes of Cyrenea seminal experimentEratosthenis**