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Sol 1^{n}\begin{aligned}(B C)^{2} & =(A C)^{2}+(A B)^{2} \\& =144+576 \\(B C)^{2} & =720 \\B C & =\text { lemyth of ladder }=\sqrt{720}=26.83\end{aligned}nearkest tenth130 Ans ...