angle
top left to right: acute, right, and obtuse angles; two pairs of alternating angles (the exterior alternating pair is light gray, the interior alternating pair is dark gray);
bottom left to right: complementary angles, supplementary angles, and adjacent angles
The American Heritage® Science Dictionary Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Learn more about angle