A foot is a foot, whether on a ruler or a tape measure, an odometer or laser range-finder or any other modern measuring instrument.
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My foot is actually about 1 foot long!
IF she just bought 50 feet then this would be too short for even one of her 56 foot requirements.
A long time ago a king wanted to see how long his foot was. His foot was exactly 12 feet long so he called that a foot.
A five dollar "foot long sub" and a ruler
12 inches