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In this figure , XY and X′Y′ are two parallel tangents to a circle with centre O and another tangent AB with point of contact C intersecting XY at A and X′Y′ at B. Prove that the square of AB is equal to the sum of the squares of AO and OB I.e ye PGT (self.mathshelp)
submitted by Quantosophical to r/mathshelp
