What value of x guarantees that the quadrilateral shown in the diagram below is cyclic? Explain.
Given quadrilateral GKHJ, m∠KGJ + m∠KHJ = 180°, m∠HNJ = 60°, KN = 4, NJ = 48, GN = 8, and NH = 24, find the area of quadrilateral GKHJ. Justify your answer.