There is a theorem about norms that says $$||\textbf{x}||\_\infty\le||\textbf{x}||\_2\le\sqrt{n}||\textbf{x}||\_\infty$$

In a text I found an illustration of this.

[![enter image description here](https://i.stack.imgur.com/uMtKP.png)](https://i.stack.imgur.com/uMtKP.png)

How does it correspond to the theorem?