## Angle Bisectors

### Angle bisectors are lines or rays that divide an angle into two equal parts

Angle bisectors are lines or rays that divide an angle into two equal parts. In other words, they divide the angle into two angles of equal measure. An angle bisector starts at the vertex of the angle and extends to the opposite side, dividing the angle into two congruent angles.

The angle bisector theorem states that an angle bisector of a triangle divides the opposite side into two segments that are proportional to the other two sides of the triangle. This theorem is based on the concept of similarity of triangles.

To construct an angle bisector, you can use a compass and a straightedge. Here are the steps involved:

1. Draw the given angle using a straightedge.

2. Place the compass’s needle on the vertex of the angle and draw an arc that intersects both sides of the angle.

3. Without changing the compass width, relocate the compass needle to one of the intersections on the side of the angle.

4. Draw another arc that intersects the first arc.

5. Use a straightedge to draw a line from the vertex of the angle to the point where the two arcs intersect. This line is the angle bisector.

Angle bisectors have numerous applications in geometry and trigonometry. They are used to solve various problems involving angles, triangles, and polygons. Additionally, angle bisectors are important in various geometric constructions and proofs.

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