\color{rgb(255,0,0)}\theta \text{ est la mesure principale de }\left( {\vec{u}; \; \overrightarrow {\text{0M} } } \right)
$$\color{rgb(127,0,0)}|z|$$
$$\color{rgb(127,0,0)}|z| = \text{OM} = \left\| \vec{w} \right\| \approx 3.49$$
$$\color{rgb(255,0,0)}\theta = arg \left( z \right) = arg\left( \vec{w} \right) = (\vec{u}, \vec{w})=\left( \vec{u}, \overrightarrow {\text{OM} } \right) \approx 0.566 \text{ }[2\pi]$$
$$\color{rgb(0,0,0)}\text{M}\left( z \right)$$
$$\color{rgb(0,0,255)}\vec{u}$$
$$\color{rgb(255,0,0)}\theta $$
$$\color{rgb(0,0,0)}\vec{w}\left( z \right)$$
$$\color{rgb(127,0,0)}\left| z \right|$$