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Euclid's Elements Book VI, Proposition 3: Angle Bisector Theorem
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The angle bisector BD of an angle in a triangle
ABC divides the opposite side in the same ratio as the sides adjacent to the angle.
See
Proposed Problem
126. Incenter of the triangle.
![Angle Bisector Theorem. Elearning.](euclid_vi_3_angle_bisector.gif)
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Typography of Euclid's Elements Book VI, Proposition 3, Mobile Apps, iPad
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