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Angle Bisector Theorem

Videos, worksheets, games and acivities to help Geometry students learn about the angle bisector theorem.

Triangle-Angle-Bisector Theorem
Using the Triangle-Angle-Bisector Theorem to solve a problem.

Proof with Algebra - Angle Bisector Theorem Review
This math problem requires a two column proof to justify finding the value of x to satisfy the given statement.

Video on Triangle Angle Bisector Theorem - Math Help
Students learn the following theorems related to similar triangles.
If a line is parallel to a side of a triangle, and it intersects the other two sides of the triangle, then it divides these sides proportionally (Triangle Proportionality Theorem).
If three parallel lines intersect two transversals, then they divide the transversals proportionally (Corollary of the Triangle Proportionality Theorem).
If a ray bisects an angle of a triangle, then it divides the opposite side of the triangle into segments that are proportional to the other two sides (Triangle Angle-Bisector Theorem).
Students are then asked to solve problems related to these theorems using Algebra.

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