An anchor is a unit of length used in typography, equal to 1/6 of a line or 1/72 of a foot. In typography, a foot is a unit of measurement equal to 12 inches or 0.3048 meters. Therefore, one anchor is equal to 1/72 of a foot, or approximately 0.0042 feet.
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There is no such unit of measurement as an anchor - if you are thinking of acre, this is a unit of area, not of length, and therefore the two units are incompatible.
A shackle is a unit of measure of anchor chains which is equal to 90 feet.
217 - 20 = 197 Therefore, it is 197 feet between the seabed (and anchor) and the sea level.
Using Pythagoras' theorem it is 26 feet
Assuming you are on a boat and you are using a standard sized anchor, then if the water is 20 feet deep you'd use 20 feet of line.
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