bisector
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it means it is cut into two congruent parts
A triangle has 6 parts ... 3 sides and 3 angles. It's possible for two triangles to have as many as 3 of their parts congruent, and the triangles still not be congruent.
Two equal parts.
You can tell if a ray is bisecting an angle if the angle is cut directly in half into two congruent parts.
Similar, YES. Congruent, NO.