August 2021 0 43 Report
В трапеции ABCD угол A = 90° Высота CE делит основание AD на два равных отрезка, точка O - середина отрезка AC.  а) Докажите, что BO/BC = CD/AD 
б) Найдите площадь треугольника ACD. если площадь невыпуклого пятиугольника AOBCD равна S.
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