Definition of Angle

An angle is formed by two rays that have a common origin.

Two intersecting lines form 4 angles. The opposing ones are congruent and the neighboring ones have the sum 180 (are supplementary angles).

AEC = DEB
AED = CEB

AEC + AED = 180
CEB + BED = 180
AEC + CEB = 180
DEA + BED = 180

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