CK-12 Geometry-Concepts

http://www.ck12.org Chapter 7. Similarity

7.10 Proportions with Angle Bisectors

Here you’ll learn how to set up and solve proportions with angle bisectors.

What if you were told that a ray was an angle bisector of a triangle? How would you use this fact to find unknown
values regarding the triangle’s side lengths? After completing this Concept, you’ll be able to solve such problems.

Watch This

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URL: http://www.ck12.org/flx/render/embeddedobject/52564

CK-12 Foundation: Chapter7ProportionswithAngleBisectorsA

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James Sousa: Triangle Angle Bisector Theorem

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James Sousa: Using the Triangle Angle Bisector Theorem to Determine Unknown Values

Guidance

When an angle within a triangle is bisected, the bisector divides the triangle proportionally