An angle bisector is a line that divides a given angle in two equal degrees. Thus the answers to the question are:
A straight line the divides a given angle into two equal degrees is referred to as an angle bisector. So that the following can be deduced from the given diagrams:
a. The construction in example 1 was correctly constructed. Since the bisector passes through the intersection of the arcs and point B. Thus dividing <ABC into two equal degrees.
b. In example 2, the bisector was incorrectly constructed. This can be observed since the bisector do not divide <ABC into two equal parts, though it passes though the intersection of the arcs and point B.
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