Text: c(p. g) b-1,6 (02) a(-3,0) d the points a (-3, 0), b (-1, 6), c (p, q) and d form a quadrilateral abcd as shown above. ac intersects the y-axis at the point (0, 3) and bd is the perpendicular bisector of ac. find (i) the coordinates of m, the point of intersection of ac and bd, and hence the coordinates of c the area of aamd, and the ratio bd: md (ii) (iii) [8] i need to find the mid-point of ac to step-by-step