A foot is a unit of distance about the length from your wrist to your elbow. Anything you can measure can be expressed in feet. If it is smaller than your arm or longer than a portion of a mile then I would probably choose a different measurement.
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A giant squid is 50 feet long with the tentacles
The mass of insects, paper clips.
rope, chain, ect
No such conversion is possible. Feet are a measure of distance or linear displacement whereas a radian is a measure of angular displacement. The two measure different things and it is not possible to convert form one to the other.
Soft drinks, alcohol, capacity of engine cylinders