When an aeroplane is 800m above the ground, its angle of ...
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?
400m
800m
1500m
1600m
1700m
Correct answer is D
From the diagram, sin30=800x
x=800sin30
= 8000.5
= 1600 m
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