# Translations:Frequency/4/en

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The period *T* and the frequency *f* are reciprocals of each other, that is, and . As we have seen, hertz is a measure of cyclic frequency, that is, a measure of the number of cycles per second. However, there is yet another type of frequency: the angular frequency , which is measured in radians per second. Angular frequency is related to cyclic frequency *f *by the fundamental relation