If figure, a quadrilateral \(A B C D\) is drawn to circumscribe a circle such that its sides \(A....

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If figure, a quadrilateral \(A B C D\) is drawn to circumscribe a circle such that its sides \(A B, B C, C D\) and \(A D\) touch the circle at \(P, Q, R\) and \(S\) respectively. If AB=x cm,BC=7 cm,CR=3 cm and AS=5 cm, find \(x\) :
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