Thet are straight lines which divide an angle into two equal parts.
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In general, they are not. In an isosceles triangle, the perpendicular bisector of the base is the same as the bisector of the angle opposite the base. But the other two perp bisectors are not the same as the angle bisectors. Only in an equilateral triangle is each perp bisector the same as the angle bisector of the angle opposite.
The point in which all the angle bisectors intersect is called the incenter.
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Angle bisectors are.
The angle bisectors always intersect inside the triangle. (This is not true for altitudes and right bisectors.)