Question

Given that the wingspan of an aeroplane is 30m, find the plane's altitude to the nearest metre if the wingspan subtends an angle of 14' when it is directly overhead.

Answer 1

The above drawing will give you the answer - you can use the tan function to find h

NOTE: it is a very minor approximation because the plane is 15m away from overhead in the drawing. However - you can be confident that the error will be so small as to be negligible in this case