Cho tứ giác ABCD có widehat A + widehat B = 200^0 Các t
A.\(\widehat {CED} = {100^0},\widehat {CFD} = {80^0}\)
B.\(\widehat {CED} = {80^0},\widehat {CFD} = {100^0}\)
C.\(\widehat {CED} = {100^0},\widehat {CFD} = {100^0}\)
D.\(\widehat {CED} = {80^0},\widehat {CFD} = {80^0}\)