Предмет: Геометрия, автор: Yifanhilam

Точка D. лежит на основании ВС равнобедренного
треугольника АВС. Докажите, что отрезок AD меньше боко-
вой стороны этого треугольника.​

Ответы

Автор ответа: utalio295
7

Ответ:

уголВДА=уголДСА+уголДАС как внеш. угол треуг.АСД при верш. Д

уголВДА=уголДВА+уголДАС, уголДСА=уголДВА как углы при основан. равнобед. ΔАВС.

В треуг.АВД уголДВА< уголВДА,  АД<AB

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