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An airplane over the Pacific Ocean sights an atoll at an 7° angle of depression. If the plane is 850 m above the water, how many kilometers is it from a point 850 m directly above the atoll?

  • Math - ,

    Draw a diagram. You will see that

    x/850 = cot 7°

    Now solve for x
    Don't forget that x is in meters, so divide by 1000 to answer in km.

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