Mathematics

When an aeroplane is 800m above the ground, its angle of elevation from a point…

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
  • E.
    1700m
Correct Answer: Option D
Explanation

From the diagram, (sin 30 = frac{800}{x})

(x = frac{800}{sin 30} )

= (frac{800}{0.5} )

= 1600 m