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The angle of elevation of the top of a lighthouse height 75.5m from a point 75.5√3 m from the foot of the lighthouse on a horizontal plane? |
45° 60° 90° 30° |
30° |
AB = height of tower Θ is angle of elevation tan Θ AB : BC 75.5 : 75.5\(\sqrt {3}\) 1 : \(\sqrt {3}\) ⇒ Θ = 30° |
