If two triangles are similar, then the ratio of corresponding sides is equal to the ratio of the angle bisectors, altitudes, and medians of the two triangles. To find a missing angle bisector, altitude, or median, use the ratio of corresponding sides.
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How to find the length of an angle bisector using similar triangles.
How to find the length of an altitude using similar triangles.
How to find the length of a median using similar triangles.