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\begin{array} { l } { \text { Find } k , \text { if } \Delta \mathrm { ABC } \text { is right angled at } \mathrm { B } , \text { where } } \\ { \mathrm { A } \equiv ( 5,6,4 ) , \mathrm { B } \equiv ( 4,4,1 ) , \mathrm { C } \equiv ( 8,2 , k ) } \end{array}

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