- one of two opposite and equal angles formed by the intersection of two lines.
Origin of vertical angle
First recorded in 1565–75
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- geometry the pair of equal angles between a pair of intersecting lines; opposite anglesAlso called: vertically opposite angles
- Two angles formed by two intersecting lines and lying on opposite sides of the point of intersection.
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