Finding length of arc RWT

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I am confused on how do you calculate the arc angle of arc RWT

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Connect $O$ with $R, S, T$. $OR=OS=OT$, therefore $\triangle{ORS} \cong \triangle{OST}$ (SSS). They are also isosceles triangles so $\angle{OSR} \cong \angle{OST}=120°/2=60°$. Apparently $\triangle{ORS}$ and $\triangle{OST}$ are equilateral. Thus, $m\angle{ORT}=120°$ and arc $RST$ has the same measure. Can you solve it now?