Если не по этим двум теоремам то тут есть ещё равнобедренный треугольники:
FDE- две бечные стороны равны(значит он равнобедренный)KLM- углы при основе равны(тоже теорема про равнобедренный треугольники) по этому он равнобедренный.ABC- две бечные стороны равны(значит он равнобедренный)Если вам нужна с этой темой, буду рад )
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