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sudut CDE dan sudut CAB
sudut CED dan sudut CBA
B. Sudut CDE = 180 - 78 - 42 = 60
Sudut CAB = 60
sudut CBA = 42
Sudut ADF = 78
sudut DFA = 42
Sudut BFD = 180 - 42 = 158
Sudut FDE = 120 - 78 = 42