$\"\"$

\

(a)

\

The two angles are $\"\"$ and $\"\"$ .

\

The initial height is $\"\"$ .

\

Draw the triangle with above specifications :

\

$\"\"$

\

The sum of the angles in any triangle is $\"\"$ .

\

The length of side is $\"\"$ .

\

The two angles are $\"\"$ and $\"\"$ .

\

The remaining angle $\"\"$ .

\

Law of sines : $\"\"$ .

\

$\"\"$

\

$\"\"$

\

$\"\"$ .

\

Therefore,the distance of flight is sum of initial height and $\"\"$ , i.e $\"\"$

\

The total distance of flight is $\"\"$ .

\

$\"\"$

\

(b)

\

Distance of direct flight and destination.

\

\

$\"\"$

\

Law of sines : $\"\"$ .

\

$\"\"$

\

$\"\"$

\

$\"\"$ .

\

Distance of direct flight and destination. is $\"\"$

\

$\"\"$

\

(a) The total distance of flight is $\"\"$ .

\

(b) Distance of direct flight and destination. is $\"\"$ .