Consider a quadrilateral ABCD (A quadrilateral is a closed figure with four straight sides) whose sides are AB, BC,CD and AD. The side AB of the quadrilateral is 8 units above the X− axis and is parallel to X− axis.The side CD lies on the X− axis. The other sides i.e., AD is parallel to side BC and the equation of the diagonal BD is 20y−8x=0. What is the length of the diagonal AC, if the coordinates of A are(7,8)?

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