SOLUTION: <a href="http://tinypic.com?ref=16pir6" target="_blank"><img src="http://i41.tinypic.com/16pir6.jpg" border="0" alt="Image and video hosting by TinyPic"></a>

Question 572183:
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
A = ab*sin(theta)

9 = 11b*sin(pi/6)

9 = 11b*(1/2)

9*2 = 11b

18 = 11b

18/11 = b

b = 18/11

So the answer is b = 18/11
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