# What does angle bisector theorem?

What does angle bisector theorem? What most textbooks call the Angle Bisector Theorem is this: An angle bisector in a triangle divides the opposite side into two segments which are in the same proportion as

## What does angle bisector theorem?

What most textbooks call the Angle Bisector Theorem is this: An angle bisector in a triangle divides the opposite side into two segments which are in the same proportion as the other two sides of the triangle.

What is the angle bisector theorem Class 10?

As per the Angle Bisector theorem, the angle bisector of a triangle bisects the opposite side in such a way that the ratio of the two line-segments is proportional to the ratio of the other two sides. Class 10 students can read the concept of angle bisector theorem here along with the proof.

What is internal angle bisector theorem?

Interior Angle Bisector Theorem : The angle bisector of an angle of a triangle divides the opposite side internally in the ratio of the sides containing the angle. Given : A ΔABC in which AD is the internal bisector of ∠A and meets BC in D. Prove that : BD / DC = AB / AC.

### Is the bisector of angle CAD?

Since AE is the bisector of the exterior ∠CAD. [The external bisector of an angle of a triangle divides the opposite side externally in the ratio of the sides containing the angle.]

What is the length of angle bisector?

The length of the angle bisector of a standard triangle such as AD in figure 1.1 is AD2 = AB · AC − BD · DC, or AD2 = bc [1 − (a2/(b + c)2)] according to the standard notation of a triangle as it was initially proved by an extension of the angle bisector up to the circumcircle of the triangle.

Why does the angle bisector theorem work?

The Angle Bisector Theorem helps you find unknown lengths of sides of triangles, because an angle bisector divides the side opposite that angle into two segments that are proportional to the triangle’s other two sides.

#### How do you divide an angle into two parts?

An angle can only be divided by a ray on the interior of the angle, though. Such a ray that divides an angle into two equal angles is called an angle bisector. Likewise, two rays that divide an angle into three congruent angles are called angle trisectors.

Does an angle bisector always create two acute angles?

An angle bisector always creates two acute angles.