How far off shore is the sinking ship, Mathematics

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A sinking ship signals to the shore for assistance. Three individuals spot the signal from shore. The ?rst individual is directly perpendicular to the sinking ship and 20 meters inland. The second is also 20 meters inland but 100 meters to the right of the ?rst individual. The third individual is also 20 meters inland but 125 meters to the right of the ?rst. How far off shore is the sinking ship? See example.

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