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Given that R = 12kΩ and C = 3.3nF, calculate the cutoff frequency (fc), unit in Hz.

The frequency response of Vo/Vi is 1/(1+j ω RC). Therefore,cut off radian frequency(Wc) is equal to 1/RC. Then, cut off frequency ω = ωc, isn't the frequency just the 1/RC which is equal to 25252.5252 .

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Yes You must convert the units from cycles per second to radians per second using ω = 2πf

or
f=1/(2πRC)

as you have done.

But since component tolerances are rarely < 1% , prudent answers only use 3 sigfigs.

so 25.3kHz is close enough, otherwise you look like a rookie.

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