Example 7.1. The table gives the distance in nautical miles of the visible horizon for the given heights in feet above the earth's surface: 100.150 200 250 300 350 400 x = height: 0 -100 y = distance: 15.04 16.81 18.4219.90 21.27 10.63 13.03 Find the values of y when (i) x = 218 ft (ii) x = 410. (Madras. B.E., 2003 S) (V.T.U., B.E., 2002).

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