By the secant-secant product theorem:



(whole_1)(outerPortion_1) = (whole_2)(outerPortion_2)



AC*YC = BC*XC



Let d = XC to make the work more clear:



Therefore, (32+3)(3) = (16+d)(d)









d = 5  -->  BC = 21  -->  AB = 



Area =  =  sq units  

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