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Let the sides be a b c and their opposite angles be A B C and so:-

Using the cosine rule angle A = 57.9 degrees

Using the cosine or sine rule angle B = 46.6 degrees

Angle C: 180-57.9-46.6 = 75.5 degrees

Area: 0.5*6*7*sin(75.5) = 20 square cm rounded

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