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Geometry 19 Online
OpenStudy (anonymous):

If two lines intersect, then the vertical angles formed must be both acute angles both equal in measure complementary angles

OpenStudy (anonymous):

both equal in measure :)

OpenStudy (anonymous):

cuz vertical angles are always congruent :3

OpenStudy (anonymous):

what a horrible reason it can be proven using the definition of supplementary angles also a straight line is 180 degrees |dw:1358262845152:dw| |dw:1358262902999:dw| the top angles are the same angle, so through arithmatic, the vertical angles must be equal to each other

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