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AED = 60
karena sudutnya bertolak belakang maka ,
AED = BEC
180 = ACB + BEC + CBD
180 = 70 + 60 + CBD
180 = 130 + CBD
180 -130 = CBD
50 = CBD
karena menghadap busur yang sama maka ,
CBD = CAD
50 = 50
180 = AED + CAD + ADE
180 = 60 + 50 + ADE
180 = 110 + ADE
180 - 110 = ADE
70 = ADE
jadi besar sudut :
ADE = 70
DAC = CAD = 50
CBD = 50
maaf kalo salah :)