5/3/2026
6 min read
The angle bisector theorem is a fundamental concept in geometry that helps us calculate the angle bisector of a triangle.
The angle bisector theorem states that the ratio of the lengths of the two segments of the opposite side is equal to the ratio of the other two sides.
AB / AC = BD / DC
Find the angle bisector of a triangle with sides 3, 4, and 5
To use the angle bisector calculator, simply enter the lengths of the three sides of the triangle and click the 'Calculate' button.
The angle bisector theorem states that the ratio of the lengths of the two segments of the opposite side is equal to the ratio of the other two sides.
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