<PRE><B>Question 25367</B>
SInce its, 2 degrees and 1 length. You must apply the sin Law to this. You can not use the Cosine law.

Let the unknown be &amp;#952;


&amp;#952;/sin42=215/sin57
&amp;#952;=215sin42/sin57
&amp;#952;=174


Hence the height of the balloon is 174ft.
Paul.</PRE>