If you mean the vertex where the two equal sides of an isosceles triangle intersect, the side is the base.
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a right angle
The base
It is the angle opposite the given side of a figure (<CAB has Vertex of A because it is the tip of the moutain, which is the highest point)
Not necessarily. The only time that the angle bisector would bisect the opposite side is if you were bisecting the vertex angle of an isosceles triangle.
An altitude.