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    Internal Bisectors Problem

    Alternate names

    internal bisectors problem | Lehmus' theorem

    Definition

    Any triangle that has two equal angle bisectors (each measured from a polygon vertex to the opposite sides) is an isosceles triangle. This theorem is also called the "internal bisectors problem" and "Lehmus' theorem."

    Related terms

    angle bisector | isosceles triangle | Thomsen's figure

    Associated person

    Jakob Steiner

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