Which line segment is an angle bisector

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METHOD 1:
Step 1: Measure the angles divided by the line segment at the vertex
NOTE: An angle bisector is a line or ray that divides an angle into two
congruent angles.
Step 2: Conclude that the line segment is angle bisector if the line segments divides the angle into to equal parts.
METHOD 2:
Step 3: Use the angle bisector theorem.
NOTE: An angle bisector of an angle of a triangle divides the opposite
side in two segments that are proportional to the other two sides of the
triangle.
Step 4: Conclude that the line segment is angle bisector if it satisfies the proportion