$$ \begin{aligned}\sqrt{6}\cdot\sqrt{6}& \xlongequal{ }\sqrt{36} \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}6\end{aligned} $$ | |
① | The square root of $ 36 $ is $ 6 $. |