exterior angle

noun

Definition of exterior angle 

1 : the angle between a side of a polygon and an extended adjacent side

2 : an angle formed by a transversal as it cuts one of two lines and situated on the outside of the line

Illustration of exterior angle

Illustration of exterior angle

ega, egb, fhc, fhd exterior angle 2

First Known Use of exterior angle

1756, in the meaning defined at sense 1

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The first known use of exterior angle was in 1756

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