3.2.1 Lines on a plane

Problem: Given the coordinates of the vertices of the triangle \( A B C-A(1,-6), B(3,4), C(-3,3) \). Find: 1.The equation of the height of \( \mathrm{CH} \) and its length; 2. The equation of the median of \( A M \) and its length; 3.The angle formed by the height of \( \mathrm{CH} \) and the median of \( A M \).