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Angles 3, 4, 5, and 6 are interior angles. Angles 3 and 6 are alternate interior angles, as are angles 4 and 5.
1. Any of the four angles formed between two straight lines intersected by a third straight line.
2. An angle formed inside a polygon by two adjacent sides.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
1. (Mathematics) an angle of a polygon contained between two adjacent sides
2. (Mathematics) any of the four angles made by a transversal that lie inside the region between the two intersected lines
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014