## Angle bisector

### a ray that divides an angle into two congruent angles

An angle bisector is a type of geometric line that bisects an angle into two equal parts. In other words, it divides an angle into two smaller angles with equal measures.

The point where the angle bisector meets the opposite side of the angle is known as the point of concurrency. This is true for any angle, from acute to obtuse angles, and this point of concurrency is also known as the incenter of the angle.

The incenter is an important point in triangle geometry, as it is equidistant from all three sides of the triangle. This means that the distance from the incenter to any side of the triangle is equal to the radius of the circle that can be inscribed inside the triangle.

Angle bisectors are useful in solving problems related to congruence and similarity of triangles, and in calculating the area and perimeter of triangles, as well as in finding the circumcenter and orthocenter of triangles.

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