The formula to calculate area of a triangle is b x h / 2 so if u were to do that to find a 9 cm squared it would be:
2x9/2 = 9 cm squared
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The area of triangle is : 90.0
Using the cosine and sine rules the area of the triangle works out as 457 square cm rounded.
Area = 0.5*10*12 = 60 square cm
Area = 0.5*15*9 = 67.5 square cm
Area = 0.5*3.4*15 = 25.5 square cm