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  1. Angle bisector theorem - Wikipedia

    • The angle bisector theorem is commonly used when the angle bisectors and side lengths are known. It can be used in a calculation or in a proof. An immediate consequence of the theorem is that the angle bisector of the vertex angle of an isosceles triangle will also bisect the opposite side. See more

    Overview

    In geometry, the angle bisector theorem is concerned with the relative lengths of the two segments that a triangle's … See more

    Theorem

    Consider a triangle △ABC. Let the angle bisector of angle ∠ A intersect side BC at a point D between B and C. The angle bisector theorem states that the ratio of the length of the line segment BD to the length of segment … See more

    Proofs

    There exist many different ways of proving the angle bisector theorem. A few of them are shown below.
    As shown in the accompanying animation, the theorem can be proved using similar triangles. I… See more

    Length of the angle bisector

    The length of the angle bisector can be found by ,
    where is the constant of proportionality from the angle bisector theorem.
    Proof: By Stewart's theorem, we have See more

    History

    The angle bisector theorem appears as Proposition 3 of Book VI in Euclid's Elements. According to Heath (1956, p. 197 (vol. 2)), the corresponding statement for an external angle bisector was given by Robert Sim… See more

    Applications

    This theorem has been used to prove the following theorems/results:
    • Coordinates of the incenter of a triangle
    Circles of Apollonius See more

    Further reading

    • G.W.I.S Amarasinghe: On the Standard Lengths of Angle Bisectors and the Angle Bisector Theorem, Global Journal of Advanced Research on Classical and Modern Geometries, Vol 01(01), pp. 15 – 27, 2012… See more

     
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  2. To construct the bisector of this right angle, draw an arc with centre at R and another arc with centre at V with same radius intersecting each other. Join the intersection point and P. This is the bisector of the right angle.
    www.vedantu.com/question-answer/draw-a-right-a…
    A bisector is a line which cuts another line exactly in half. A perpendicular bisector cuts a line exactly in half and intersects it at a right angle. It can be constructed using a ruler and pair of compasses.
    www.bbc.co.uk/bitesize/topics/zdr9wmn/articles/zn…
    The angle bisector in geometry is the ray, line, or segment which divides a given angle into two equal parts. For example, an angle bisector of a 60-degree angle will divide it into two angles of 30 degrees each. In other words, it divides an angle into two smaller congruent angles.
    www.cuemath.com/geometry/angle-bisector/
    To bisect an angle with straightedge and compass, one draws a circle whose center is the vertex. The circle meets the angle at two points: one on each leg. Using each of these points as a center, draw two circles of the same size. The intersection of the circles (two points) determines a line that is the angle bisector.
    en.wikipedia.org/wiki/Bisection
     
  3. Angle Bisector Theorem (in a Triangle) - Proof and Examples

     
  4. Angle Bisector Theorem - Proof, Converse, Formula, …

    Angle bisector theorem states that the bisector of any angle will divide the opposite side in the ratio of the sides containing the angle. Learn more about this interesting concept of triangle angle bisector theorem formula, proof, and …

  5. Angle Bisector Theorem | Brilliant Math & Science Wiki

  6. Angle Bisector Theorem - GeeksforGeeks

  7. Angle Bisector - Definition, Construction, Properties, …

    An angle bisector is defined as a ray that divides a given angle into two congruent angles. Learn more about the angle bisector of a triangle and angle bisector theorem with concepts, properties, and examples.

  8. Angle Bisector: Definition, Properties, Theorem, …

    May 16, 2024 · What is an Angle Bisector? An Angle Bisector, within geometry, is a ray, line, or segment that effectively splits a given angle into two equal parts. In simpler terms, it's a method of dividing an angle into two equal angles.

  9. Angle Bisector Theorem: Definition, Formula, Proof, …

    The angle bisector theorem states that a bisector of an angle of a triangle divides the opposite sides in the same ratio as the ratio of other two sides.

  10. Angle Bisector of a Triangle – Definition, Theorem, …

    Apr 25, 2024 · An angle bisector of a triangle is a line segment that bisects a vertex angle of a triangle and meets the opposite side of the triangle when extended. They are also called the internal bisector of an angle.

  11. Angle bisector - Math.net

    An angle bisector is a line segment, ray, or line that divides an angle into two congruent adjacent angles. Line segment OC bisects angle AOB above. So, ∠AOC = ∠BOC which means ∠AOC and ∠BOC are congruent angles.

  12. trigonometry - Angle bisector in a right angled triangle

    In a right angled triangle, the legs adjacent to the right angle are equal to $a$ and $b$. Prove that the length of the bisector (of the right angle) is equal to $$\frac{a\cdot b\cdot \sqrt{2}}{a+b}.$$

  13. Angle Bisector – Definition, Properties, Construction - SplashLearn

  14. Bisectors in a Triangle - Varsity Tutors

  15. What is Angle Bisector? Definition, Properties, Construction, …

  16. Triangle Angle Bisector Theorem - Varsity Tutors

  17. Triangle Angle Bisector Theorem - Mathwarehouse.com

  18. Angle Bisector (Definition, Examples) - BYJUS

  19. Angle Bisector - Definition, Examples & Practice Problems

  20. Angle bisector definition - Math Open Reference

  21. What is Angle Bisector? Definition, Properties, Construction