How far can you see from the ship's mast, whose peak is at 14 meters above sea level? (Earth's radius is 6370 km).

Correct result:

x =  13.4 km


x=26370141000+(141000)2=13.4 kmx = \sqrt{ 2\cdot 6370\cdot \dfrac{ 14}{1000} + \left( \dfrac{ 14}{1000}\right)^2} = 13.4 \ \text{km}

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