Area of a non-right triangle

To find the area of a non-right triangle, use this formula:
Area=1/2(leg)(other leg)sin(angle between)
So,

EXAMPLE
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    78 degrees
    /\
9 /  \  12
  /__\              
                         
In triangle ABC, a = 12, B = 78 degrees, and c = 9. Find area of the triangle.
Area=1/2(12)(9)sin(78)
Area=15.82