Vertical (angles)
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A pair of angles are said to be vertical if they share the same vertex and are bounded by the same pair of lines but are opposite to each other. If a pair of angles are vertical, then they are (congruent). More precisely, if two lines AB and CD intersect at E, and E is between A and B, and E is between C and D, then angle AEC is vertical to angle BED, and angle AED is vertical to angle BEC.
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