[tex]\begin{gathered} (LM)^2=8^2+18^2 \\ LM\text{ =}\sqrt[]{64+324} \\ LM\text{ = }\sqrt[]{388} \\ LM\text{ =}19.6977156 \end{gathered}[/tex]
In the simplest radical form
[tex]\begin{gathered} LM\text{ = }\sqrt[]{4\text{ }}\times\sqrt[]{97} \\ LM\text{ = 2}\sqrt[]{97} \end{gathered}[/tex]
