An angle bisector.
Not necessarily
not all congruent angles are vertical angles. Vertical angles must share a vertex.
NO
have the same vertex. be congruent.
be congruent and have the same vertex
Only if the vertex angle being bisected is between the sides of equal length will the result be two congruent triangles.
The base angles of an isosceles triangle are congruent. The vertex angle of an isosceles triangle is not necessarily congruent to the base angles.
The top and bottom angles - the angles that are between the pairs of congruent sides. They are opposite each other and not necessarily congruent.
No
Vertical angles must necessarily be congruent, however congruent angles do not necessarily have to be vertical angles. An example of congruent angles which are not vertical angles are the 3 interior angles of an equilateral triangle. These angles do not share the same vertex yet they are congruent.
They're similar triangles.
C. have the same vertex. done D. be congruent