In the diagram below, what kind of line is BF relative to ABC?

Line BF is one of the three angle bisectors that meet at point F (incenter), hence, line BF as it relates to ABC is called the: interior angle bisector.
An interior angle bisector can be described as the line segment that divides an interior angle into two halves.
When the three interior angle bisector of a triangle meet at a point, the point is referred to a the incenter.
The diagram guven shows the incenter where the three interior angle bisectors meet.
Therefore, line BF as it relates to ABc is called the: interior angle bisector.
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