В правильной четырехугольной пирамиде SABCD{"color":"#202335","fontFamily":"stix","language":"ru"} точка O{"color":"#202335","fontFamily":"stix","language":"ru"} — центр основания, S{"color":"#202335","fontFamily":"stix","language":"ru"} — вершина, SO=20{"color":"#202335","fontFamily":"stix","language":"ru"}, BD=42{"color":"#202335","fontFamily":"stix","language":"ru"}. Найдите боковое ребро SC{"color":"#202335","fontFamily":"stix","language":"ru"}.
