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alternate angle
Angles 3,6 and 4,5 are alternate interior angles; angles 1,8 and 2,7 are alternate exterior angles.
The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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