Each time the transversal t crosses a parallel line, two sets of opposite angles are formed. ... • Drag points A or B to change the direction of the lines • What happens to the measures of the "vertical angles"? ... If two angles are vertical, then their measures are equal.
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argyll.epsb.ca/jreed/javaMath/geometry/oppangl.html
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Angles a° and c° are also vertically opposite, so must also be equal, which means they are 140° each. ... Vertically Opposite Angles are the angles opposite each other when two lines cros ... Language Note: "Vertically Opposite Angles" are usually called Vertical Angles in the US...
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www.mathsisfun.com/geometry/vertically-opposite-angles....
www.mathsisfun.com/geometry/vertically-opposite-angles.html
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An introduction to vertically opposite angles and their properties. ... Vertically opposite angles are angles that are opposite to each other and are also equal.
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www.mathsteacher.com.au/year7/ch08_angles/04_vert/opp.h...
www.mathsteacher.com.au/year7/ch08_angles/04_vert/opp.htm
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Opposite Angles are Equal - demonstrated on an interactive Java applet...
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www.rfbarrow.btinternet.co.uk/htmks3/Angle1.htm
www.rfbarrow.btinternet.co.uk/htmks3/Angle1.htm
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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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Theorem 1. Vertically opposite angles are equal in measure. ... In the following Flash movie you will see that the opposite angles when lines intersect are equal in measure. ... Now you can try some questions to see if you understand the theorem.
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www.teachnet.ie/tbrophy/theorem1.html
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Vertically opposite angles ... The two angles marked in this diagram are called vertically opposite angles and are equal to each other. ... Two lines crossing showing the vertically opposite angles...
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www.bbc.co.uk/scotland/education/bitesize/standard/math...
www.bbc.co.uk/scotland/education/bitesize/standard/mathsI/pythagoras/line_angles_facts_rev4.shtml
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The perpendicular from the centre to the chord bisects the chord ... In the diagram below, AB is the chord of a circle with centre O. ... OMA and OMB are both right angles.
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www.bbc.co.uk/schools/gcsebitesize/maths/shapes/circles...
www.bbc.co.uk/schools/gcsebitesize/maths/shapes/circles2hirev7.shtml
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