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triangulating triangle and reassembling them

Source: Putnam 1982 B1

September 27, 2021
geometry

Problem Statement

Let MM be the midpoint of side BCBC of △ABC\triangle ABC. Using the smallest possible nn, described a method for cutting △AMB\triangle AMB into nn triangles which can be reassembled to form a triangle congruent to △AMC\triangle AMC.
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