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Exterior angle

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exterior angle

–noun Geometry.
1. an angle formed outside parallel lines by a third line that intersects them.
2. an angle formed outside a polygon by one side and an extension of an adjacent side; the supplement of an interior angle of the polygon.

Origin:
1885–90
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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exterior angle  


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n.  
  1. The angle between any side of a polygon and an extended adjacent side.

  2. Any of the four angles that do not include a region of the space between two lines intersected by a transversal.

The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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