eh tolong dong pakai cara........

Sudut COD =4x +2 = 90
4x = 90 - 2
4x = 88
X = 88 : 4 = 22
Sudut BOC =22 + 3 = 25
Sudut ADB = 180 - 25 = 155 derajat
Maaf kalo salah
Kalo mau nanya komen aja