Two questions i have partly done.

1. Prove that in a plane triangle ABC

The bearing of an aeroplane from a fixed observation post is

, the aeroplane being at a horizontal distance of 6 miles from the post. Calculate the flight direction of the aeroplane if, when it passes due east of the post, it is at a horizontal distance of 9 miles from the post. If the height of the aeroplane when its bearing is

is

*h* and its angle of elevation from the post is the same in both positions calculate, in terms of

*h*, the height of the aeroplane when due east of the post.

In the figure

I first fin the length AB=

then angle PAX=[math\frac{9\sin 38^o}{5.65}=78.9^o[/tex]

Then using the opposite angles on parallel lines, the direction of the plane would be

Answer is supposed to be 131