A triatomic molecule can rotate about any of three co-ordinate axes.
The molecule of a triatomic gas has a tendency of rotating about any of three co-ordinate axes. So, it has $6$ degrees of freedom, $3$ translational and $3$ rotational. At high enough temperature, a triatomic molecule has $2$ vibrational degrees of freedom. But as temperature requirement is not given, so we answer simply by assuming triatomic gas molecule at room temperature.
Thus,
$f=6$
($3$ translational $+3$ rotational) at room temperature.
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