1.2 the picture below shows the triangular rooftop of a building. The diagram next to the picture represents triangular rooftop in the Cartesian plane with origin O. In the diagram, Al-2;-1), B(-4;k) and C(2, 1) are the vertices of AABC with M-1; 2) the midpoint of BC The angle of inclination, 0, is the angle between AC and the positive x-axis B-4k) y M(-1,2) CQ2:1) A(-2:-1) PICTURE DIAGRAM 1.1 Determine: 1.1.1 The numerical value of k 1.1.2 The gradient of AC 1.1.3 The size of (in degrees) 1.1.4 The equation of straight line BC in the form y-.. If O is the midpoint of AC, use analytical geometry methods to show that: 1.2.1 MO BA 1.2.2 MO = BA 1/2
