$$\left. \begin{array} { l } { 120 ^ { \circ } } \\ { 060 ^ { \circ } } \\ { 240 ^ { \circ } } \\ { 240 ^ { \circ } } \end{array} \right.$$
$60,120,240,240$
$$120$$
$$60,120$$
$$60,120,240$$
$$60,120,240,240$$
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$120,\ 60,\ 240,\ 240$