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Question 572183: Image and video hosting by TinyPic
Answer by jim_thompson5910(35256) About Me  (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