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Mathematics 21 Online
OpenStudy (anonymous):

decide wheather the statement is valid definition if two angles are not adjacent then they are vertical angles

OpenStudy (anonymous):

???

Directrix (directrix):

@Jaaaaneeel I looked in my Geometry text to find a formal defintion of vertical angles. Vertical angles are angles whose sides form two pairs of opposite rays. A diagram is given as I have drawn below. Angles 1 and 2 are a pair of vertical angles as are Angles 3 and 4. |dw:1348558356344:dw|

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