Отрезки AB{"color":"#202335","fontFamily":"stix","language":"ru"} и DC{"color":"#202335","fontFamily":"stix","language":"ru"} лежат на параллельных прямых, а отрезки AC{"color":"#202335","fontFamily":"stix","language":"ru"} и BD{"color":"#202335","fontFamily":"stix","language":"ru"} пересекаются в точке М{"color":"#202335","fontFamily":"stix","language":"ru"}. Найдите МС{"color":"#202335","fontFamily":"stix","language":"ru"}, если АВ=15{"color":"#202335","fontFamily":"stix","language":"ru"}, DC=30{"color":"#202335","fontFamily":"stix","language":"ru"}, АС=39{"color":"#202335","fontFamily":"stix","language":"ru"}.
