A cliff on the bank of a river 87 m high. A boat on the river is 22 m away from the cliff. Calculate, correct to the nearest degree, the angle of depression of the boat from the top of the cliff.
From the figure above, using SOH CAH TOA
Tan\(\alpha\) = \(\frac{\text{opposite}}{\text{adjacent}}\)
Tan\(\alpha\) = \(\frac{87}{22}\) = 3.9545
\(\alpha\) = Tan\(^{-1}\)(3.9545) = 76º
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