
The exterior angle of a polygon is made by extending one of the sides at a vertex, then taking the angle between the extended side and side of the polygon.^{[1][2]} Note that the sum of the measure of an interior angle of a polygon and the measure of the corresponding exterior angle is 180° or π radians. 

When two parallel lines are intersected by a third line called a transversal, the angles on the outside of the parallel lines are the exterior angles. Note that the sum of the measure of the exterior angle and the measure of the corresponding interior angle is 180° or π radians. 
#  A  B  C  D 
E  F  G  H  I 
J  K  L  M  N 
O  P  Q  R  S 
T  U  V  W  X 
Y  Z 
All Math Words Encyclopedia is a service of
Life is a Story Problem LLC.
Copyright © 20052011 Life is a Story Problem LLC. All rights reserved.
This work is licensed under a Creative Commons AttributionNoncommercialShare Alike 3.0 License