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[" A triangle "ABC" lying in the first q...

[" A triangle "ABC" lying in the first quadrant has two vertices as "A(1,2)" and "B(3,1)" .If "/_BAC=],[90^(@)," and "ar(Delta ABC)=5sqrt(5)" sq.units,then the abscissa of the vertex "C" is: "],[" (A) "1+sqrt(5)]

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