Posted by tori on Friday, February 17, 2012 at 3:12pm.
75° 15' = 75.25°
Use the cosine law
a^2 = b^2 + c^2 - 2(bc)cosA
= 16+81-2(36)cos75.25
= 78.668659...
a = √.... = 8.8695 or appr 8.87
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