tolong bantu pake cara ya

∠OAD = ∠ODA = 53°
∠OAD + ∠OAB = 90°
53 + ∠OAB = 90
∠OAB = 90-53 = 37°

ADO + ODC = 90
53 + ODC = 90
ODC = 90-53 = 37°

ODC = DAO = 37
37+53 + x = 180
x = 180 -90
= 90°