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.
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
Applicable units are those of quantitykind:PlaneAngle
Plane Angle
Rovinný úhel
Sudut satah
angle plan
angolo piano
angulus planus
düzlemsel açı
ebener Winkel
kąt płaski
medida angular
ravninski kot
szög
unghi plan
ángulo plano
Επίπεδη γωνία
Плоский угол
Равнинен ъгъл
זווית
الزاوية النصف قطرية
زاویه مستوی
क्षेत्र
弧度
角度