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How far away from a lighthouse on shore can aship be seen if the observer in the lighthouse is100 ft above the surface of the

How far away from a lighthouse on shore can aship be seen if the observer in the lighthouse is100 ft above the surface of the Earth? Radiusof the Earth is 20.93 x 10^6 feet1000 FT5000 FT22032 FT10297 FT

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