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alternate angle
al·ter·nate an·gle (plural al·ter·nate an·gles)


noun 
Definition:
 
angle opposite another: one of a pair of angles on opposite sides and at opposite ends of a line that cuts two other lines
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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