[tex]A=(2,-1)\\B=(6,7)\\C=(2,4)\\o=\sqrt{(x_{2}-x_{1})^{2}+(y_{2} -y_{1} ) ^{2} } \\|AB|=\sqrt{(6-2)^{2} +(7+1)^{2} } =4\sqrt{5} \\|AC|=\sqrt{(2-2)^{2} +(4+1)^{2} } =5\\|BC|=\sqrt{(2-6)^{2} +(4-7)^{2} }=5\\Ob=4\sqrt{5}+5+5=4\sqrt{5} +10[/tex]
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[tex]A=(2,-1)\\B=(6,7)\\C=(2,4)\\o=\sqrt{(x_{2}-x_{1})^{2}+(y_{2} -y_{1} ) ^{2} } \\|AB|=\sqrt{(6-2)^{2} +(7+1)^{2} } =4\sqrt{5} \\|AC|=\sqrt{(2-2)^{2} +(4+1)^{2} } =5\\|BC|=\sqrt{(2-6)^{2} +(4-7)^{2} }=5\\Ob=4\sqrt{5}+5+5=4\sqrt{5} +10[/tex]