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ABCD circumscribes a circle. Tangents from an external point to a circle are equal. .•. AP=AS(tangents frm A,P is pt of contact)-------1 BP=BQ(tangents frm B,Q is pt of contact)-------2 CR=CQ(tangents frm C,R is pt of contact--------3 DR=DS(tangents frm D,S is pt of contact)-------4 From eq. 1,2,3&4 AB+CD=AD+BC =5+9=AD+8 =14-8=AD =AD=6cm
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