Aplane takes off at an angle of elevation of 15 degrees and travels in a straight line for 3,000 meters. what is the height of the plane above the ground at this instant?

SOH CAH TOA tells you the sine function of an angle gives the ratio of opposite side to the hypotenuse of the right triangle.
  Sin = Opposite/Hypotenuse
In this problem, the angle is 15°, the hypotenuse is 3000 m and we want to find the length of the opposite side (the height above the ground).

  sin(30°) = height/(3000 m)
Multiplying by 3000 m, we get
  height = (3000 m)*sin(30°) = 1500 m

The height of the plane at that instant is ...
  1500 m

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