Your answer is correct but your presentation of the final answer is a problem.

It should be:

Area of total figure = 452.16 + 78.5 + 120 = 650.66

Hence Area of shaded part = Area of total figure – Area of semi circle = 650.66 -265.33 = 385.33cm²

Your presentation of the final part is incorrect:

Area of shaded part = 452.16 + 78.5 + 120 = 650.66 -265.33 = 385.33cm²  is technically wrong because 452.16 + 78.5 + 120  is not equal to 650.66 -265.33 

Do not join the calculation this way, either split into above like what I have written or put everything in one line

452.16 + 78.5 + 120 – 265.33 = 385.33cm²