When an aeroplane is 800m above the ground its ... - WAEC Mathematics 1998 Question
When an aeroplane is 800m above the ground, its angle of elevation from a point P on the ground is 30o. How far is the plane from P by line of sight?
A
400m
B
800m
C
1500m
D
1600m
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Correct Option: D
From the diagram, \(\sin 30 = \frac{800}{x}\)
\(x = \frac{800}{\sin 30} \)
= \(\frac{800}{0.5} \)
= 1600 m
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