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two angles that are formed when one angle is divided into two parts by a straight line

maths the shape that is made where two straight lines join or cross each other. Angles are measured in degrees. An angle that measures 90 degrees is a right angle; if it is less than 90 degrees, it is an acute angle, and if it is more than 90 degrees, it is an obtuse angle.

the angle of the imaginary line between the position of a plane, ship etc and the position of another object

the two inside corner angles formed where a straight line crosses two parallel lines

the angles opposite each other that are formed when two lines intersect (=cross each other)

gaslight

to manipulate someone psychologically so that they begin to question their own perceptions and memories

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Open Dictionary

Dunning-Kruger effect

the phenomenon by which an incompetent person is too incompetent to understand his own incompetence

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