WAEC - Mathematics (1999 - No. 20)
From the top of a cliff 20m high, a boat can be sighted at sea 75m from the foot of the cliff. Calculate the angle of depression of the boat from the top of the cliff
14.9 o
15.5 o
74.5 o
75.1 o
解释
From the diagram above:
\(\tan \theta = \frac{20}{75} = 0.267\)
\(\theta = \tan^{-1} 0.267 = 14.93°\)
\(\approxeq\) 14.9°