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A person stands on a cliff overlooking the sea. He is 100m above the sea level and he observes the horizon to be 5mrad below the local horizontal.
How do you calculate the radius from this information without using a calculator? Trigonometry I am guessing, but I need a better hint.
How do you calculate the radius from this information without using a calculator? Trigonometry I am guessing, but I need a better hint.