A vertex angle is an angle found in all geometric figures in which two line segments become connected forming an angle that is measured from the inside walls of the two connecting
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It is a point.
http://wiki.answers.com/Q/What_is_the_vertex_on_a_...

The vertex angle is the angle formed by the two legs of equal length. The
http://www.chacha.com/question/whatisthevertex...

Gideon said it, there's nothing else to add.
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