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Diameter,tangent & intersection point

Source: BdMO National 2018

February 27, 2019
geometrycirclesTrianglecontests

Problem Statement

BdMO National 2018 Higher Secondary P2
ABAB is a diameter of a circle and ADAD & BCBC are two tangents of that circle.ACAC & BDBD intersect on a point of the circle.AD=aAD=a & BC=bBC=b.If a≠ba\neq b then AB=?AB=?
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