The distance form the coast to the helicopter is 1820 ft.
The situation forms a right angle triangle.
Right angle triangle
Right angle triangles are triangle that has one of its angles as 90 degrees.
Therefore, the height of the helicopter is the opposite side of the triangle formed.
How far off the coast to the helicopter is the adjacent side. Therefore,
tan 30°= opposite / adjacent
tan 30° = 1050 / a
cross multiply
a = 1050 / 0.57735026919
a = 1819.75736568
a = 1820 ft
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