On the construction of a triangle from the feet of its angle bisectors - Alexey V. Ustinov

  1. Tác giả: LTTK CTV
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    On the construction of a triangle from the feet of its angle bisectors - Alexey V. Ustinov​

    We give simple examples of triangles not constructible by ruler and compass from the feet of its angle bisectors when the latter form a triangle with an angle of 60 or 120 degrees.

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