 quantitykind:PlaneAngle

Type
Description

The inclination to each other of two intersecting lines, measured by the arc of a circle intercepted between the two lines forming the angle, the center of the circle being the point of intersection. An acute angle is less than $$90^\circ$$, a right angle $$90^\circ$$; an obtuse angle, more than $$90^\circ$$ but less than $$180^\circ$$; a straight angle, $$180^\circ$$; a reflex angle, more than $$180^\circ$$ but less than $$360^\circ$$; a perigon, $$360^\circ$$. Any angle not a multiple of $$90^\circ$$ is an oblique angle. If the sum of two angles is $$90^\circ$$, they are complementary angles; if $$180^\circ$$, supplementary angles; if $$360^\circ$$, explementary angles.

Properties
An angle formed by two straight lines (in the same plane) angle - the space between two lines or planes that intersect; the inclination of one line to another; measured in degrees or radians
Annotations
The inclination to each other of two intersecting lines, measured by the arc of a circle intercepted between the two lines forming the angle, the center of the circle being the point of intersection. An acute angle is less than $$90^\circ$$, a right angle $$90^\circ$$; an obtuse angle, more than $$90^\circ$$ but less than $$180^\circ$$; a straight angle, $$180^\circ$$; a reflex angle, more than $$180^\circ$$ but less than $$360^\circ$$; a perigon, $$360^\circ$$. Any angle not a multiple of $$90^\circ$$ is an oblique angle. If the sum of two angles is $$90^\circ$$, they are complementary angles; if $$180^\circ$$, supplementary angles; if $$360^\circ$$, explementary angles.
Plane Angle(en)

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