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Answer :

The trick in here is to break the composite figure into parts.

1. Calculate area of the circle

5.1^2*pi*(120/360) = 27.24

2. Calculate area of the rectangular prism

5.1*3.2 = 16.32

3. Calculate the are of the triangle

5.1*(7.4-3.2)*0.5 = 10.71

4. Add them up

27.24 + 16.32 + 10.71 = 54.27

Answer: 54.27