Posted by Gabby on Sunday, January 13, 2013 at 9:49pm.
Looks like the angle at B is 150° and we can just use the cosine law:
AC^2 = 12^2 + 9^2 - 2(12)(9)cos 150°
= 225 - 216( -√3/2)
= ....
AC = + √ .....
I got AC = appr 20.3
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