3.2.i Lines on a plane

Condition: Using the coordinates of the vertices of the triangle \( A B C \), find: 1) The perimeter of the triangle, 2) The equations of the sides \( A B \) and \( B C \). \[ A=(3 ;-3), \quad B=(7 ;-3), \quad C=(5 ; 5) \text {. } \]