Angle
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Angle
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°; a right angle 90
°; an obtuse angle, more than 90° but less than 180 °; a straight angle, 180°; a reflex angle, more than 180° but less than 360°; a perigon, 360°. Any angle not a multiple of 90° is an oblique angle. If the sum of two angles is 90°, they are complementary angles; if 180°, supplementary angles; if 360°, explementary angles. Two adjacent angles have a common vertex and lie on opposite sides of a common side. A dihedral angle is the angle between two intersecting planes. A spherical angle is the angle between two intersecting great circles.
References
This article is based on NASA's Dictionary of Technical Terms for Aerospace Use