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In the diagram below, angles 1 and 4 are vertical. So are angles 2 and 3. Vertical angles are angles opposite one another at the intersection of two lines. Vertical angles are congruent.
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www.mathwords.com/v/vertical_angles.htm
www.mathwords.com/v/vertical_angles.htm
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Vertical angles explained with examples and a practice quiz. ... Interactive Vertical Angles (Full Size Interactive Vertical Angles) ; Click and the points below to see the rule for vertical angles in action.
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www.mathwarehouse.com/geometry/angle/vertical-angles.ph...
www.mathwarehouse.com/geometry/angle/vertical-angles.php
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When two lines intersect they form 4 angles. The angles that are directly opposite each other have equal measurements. These angles are called vertical angles.
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www.learningwave.com/lwonline/geometry_section1/lessons...
www.learningwave.com/lwonline/geometry_section1/lessons/vertical1.html
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Definition and properties of vertical (or opposite) angles ... As can be seen from the figure above, when two lines intersect, four angles are formed. Each opposite pair are called vertical angles and are always congruent. The red angles ∠JQM and ∠LQK are equal, as are the blue angles ∠JQL and ∠MQK.
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www.mathopenref.com/anglesvertical.html
www.mathopenref.com/anglesvertical.html
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Vertical (angles) - Wikipedia, the free encyclopedia
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A pair of angles is said to be vertical (US English) or vertically opposite (British English) if the angles share the same vertex and are bounded by the same pair of lines but are opposite to each...
en.wikipedia.org/wiki/Vertical_(angles)
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Vertical Angles are the angles opposite each other when two lines cross ... In this example, a° and b° are vertical angles. ... The interesting thing here is that vertical angles are equal:
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www.mathsisfun.com/geometry/vertical-angles.html
www.mathsisfun.com/geometry/vertical-angles.html
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Conjecture (Vertical Angle Conjecture ): If two angles are vertical, then they are equal in measure. ... Vertical Angles Conjecture ... Vertical angles are non-adjacent angles formed by a pair of intersecting lines. You can think of them as the opposite angles that appear in the "bow-tie" formed when two lines intersect.
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www.geom.uiuc.edu/~dwiggins/conj01.html
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Vertical Angles Conjecture ... To determine your understanding of the Vertical Angles Conjecture. Typical geometric problems requiring the ideas of this conjecture are given for you to solve. ... Use a protractor to measure pairs of vertical angles. For example, measure the angles AEC and BED. What happens?
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www.geom.uiuc.edu/~dwiggins/act01.html
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