## Angle bisector

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

An angle bisector is a straight line or a ray which divides an angle into two equal parts. It originates from the vertex of the angle and extends to the opposite side or arc. The point where the angle bisector meets the opposite side or arc is called the point of intersection. This point divides the opposite side or arc into two segments whose lengths are proportional to the lengths of the adjacent sides of the angle.

Properties of angle bisectors:

– Any point on the angle bisector is equidistant from the sides of the angle.

– The angle bisector divides the angle into two angles of equal measure.

– The length of the segment joining the vertex of the angle and the point of intersection of the angle bisector to the opposite side or arc is proportional to the lengths of the adjacent sides of the angle.

– The angle bisectors of a triangle meet at a point called the incenter, which is equidistant from the sides of the triangle.

Applications of angle bisectors:

– In geometry problems involving triangle measurements, the angle bisector theorem is often used to find unknown side lengths or angles.

– The incenter of a triangle is important in the construction of various geometric shapes, such as circles, inscribed triangles, and tangent lines.

– In navigation and surveying, the use of angle bisectors is crucial for accurate measurements and calculations of angles and distances.

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