Mathematics for IGCSE & O level - Pythagoras' Theorem And Trigonometry (Section 2 - No. 39)
If the angle of elevation from a boat to the top of a cliff is 60°, and the cliff is 20 meters tall, what is the approximate distance from the boat to the base of the cliff?
10 meters
17.32 meters
20 meters
34.64 meters
Explanation
tan(60°) = 20/distance, distance = 20/tan(60°) ≈ 17.32
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