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For part a, apply the sine rule.
For part b, after finding AC, u should be able to get BC with the 40deg, then u can get area ABC. U can get area ACD by using the formula 1/2 ABsin(c) to find triangle areas.
For part b, after finding AC, u should be able to get BC with the 40deg, then u can get area ABC. U can get area ACD by using the formula 1/2 ABsin(c) to find triangle areas.