В треугольнике ABC{"color":"#202335","fontFamily":"stix","language":"ru"} с тупым углом BAC{"color":"#202335","fontFamily":"stix","language":"ru"} проведены высоты BB1{"color":"#202335","fontFamily":"stix","language":"ru"} и CC1.{"color":"#202335","fontFamily":"stix","language":"ru"} Докажите, что треугольники AB1C1{"color":"#202335","fontFamily":"stix","language":"ru"} и ABC{"color":"#202335","fontFamily":"stix","language":"ru"} подобны.
