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Question 572185: 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)/2

13 = 7b*sin(60)/2

13 = 7b*(sqrt(3)/2)/2

13 = 7b*(sqrt(3)/4)

13*4 = 7b*sqrt(3)

52 = 7b*sqrt(3)

52/(7*sqrt(3)) = b

b = (52*sqrt(3))/21


So the answer is