Vertical (angles)

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The two lines intersect to create two pairs of vertical angles. Angles A and B are equal, as are angles C and D.

A pair of angles are said to be vertical (US English) or hi (British English) if they share the same vertex and this means that the angles are congruent. They are bounded by the same pair of lines but are opposite to each other. Such angles are vertical (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.

[edit] External links

• Definition and properties of vertical angles With interactive applet
• Angle definition pages with interactive applets that are also useful in a classroom setting. Math Open Reference

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