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6. From the top of a lighthouse, 100 m above sealevel, the angle of depression of a ship, sailingtowards it, changes from 30° to 45°. Determine thedistance travelled by the ship during the period ofobservation |
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Answer» ans: (√3 - 1)cuz tanα=perpendicular / basegiven perpendicular is 100m. α1=30°,α2=45° .put the values in above formula get 2 equations and solve them. Then difference between the two values give the the distance. |
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