3.3.16 Line and plane in space
Condition: Find the angle \( A \), the length of the median \( B O \) in the triangle \( A B C \), if \( A(1 ;-1 ; 3) \), \( B(3 ;-1 ; 1) \) and \( C(-1 ; 1 ; 3) \).
Straight lines and planes in space. Intersection of lines and planes, calculation of the distance of a line and a plane, angles between lines and planes, finding equations of lines and planes in space, and much more.