Question 1142822
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Note: 6400 mils= 360 degrees.
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{{{12*mils*(360/6400)(degrees/mils)}}}

0.675 degrees


d, distance from boat to cliff bottom

{{{90/d=tan(0.675)}}}

{{{d/90=1/tan(0.675)}}}

{{{highlight(d=90/tan(0.675))}}}