There a quadrilateral ABCD has vertices A (1,-3), B (3,-1), C (6,-2) and D (6,-5). Find the coordinates of the image of the vertices of the image of quadrilateral ABCD under a rotation of 90 degree clockwise about the origin (0,0).
A'(-3,-1), B'(-1,-3), C'(-2,-6), D'(-5,-6)