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abstraction > mathematical concept > unit > angle unit

angle unit
subject			fact

angle unit	is a unit of angle
	is a kind of unit
unit	has historical origin
	represents

Kinds of angle unit :

• arcminute (3 facts) - A unit of angle equal to 1/60 of a degree.
• arcsecond (4 facts) - One sixtieth of an arcminute, or 1/3600 of a degree.
• degree (2 facts) - An angle subtended in the sky: From the zenith to the horizon is 90 degrees.
• radian (9 facts) (rad) - Unit of angular measure equal to the angle subtended at the centre of a circle by an arc the length of which is equal to the radius. There are 2π radians in a circle. The angle π/4 is called an octant and a thousandth of a radian is sometimes called a mil, which is equal to 3 minutes 26.5 seconds of arc., A measure of angular distance; 2π radians equals 360 degrees.