Definitions for vertical angle
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Random House Webster's College Dictionary
ver′tical an′gle(n.)
one of two opposite and equal angles formed by the intersection of two lines.
Category: Math
Origin of vertical angle:
1565–75
Princeton's WordNet
vertical angle(noun)
either of two equal and opposite angles formed by the intersection of two straight lines
Citation
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"vertical angle." Definitions.net. STANDS4 LLC, 2013. Web. 19 Jun 2013. <http://www.definitions.net/definition/vertical angle>.

