Question

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 4 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 21y - 4x=0. What is the length of the diagonal AC, if the coordinates of A are (9,4)?​

Answer 1

Answer:

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