The sides AB, BC, CD and DA of a quadrilateral have theequations x + 2y = 3, x= 1, x-3y = 4 and 5x + y + 12 = 0respectively. Find the angle between the diagonals AC andBD.​
The sides AB, BC, CD and DA of a quadrilateral have theequations x + 2y = 3, x= 1, x-3y = 4 and 5x + y + 12 = 0respectively. Find the angle between the diagonals AC andBD.​