a corner.
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Because in math the definition for vertex is !the point of a geometric figure that is opposite the base. So in this case, the point is the vertex.
Gee, Hard problem
an angle in an circle whos vertex is on the circle.
Not exactly because for example two sides of a polygon meet at a vertex which is singular for vertices.
No, complementary angles do not need to have the same vertex. Complementary angles are comprised of any two angles whose sum is 90 degrees. The definition of a complementary angle does not say that it needs to have the same vertex.