Answer:
Step-by-step explanation:
triangle ADB and ADC are congruent.
So ∠B = ∠C
∠B = 47
∠ADC = ∠ADB
∠ADC + ∠ADB = 180 { straight angle}
2∠ADB =180
∠ADB = 180/2
x = 90
In ΔADB,
∠B + x + y = 180 { sum of all angles of triangle}
47 + 90 + y = 180
137 + y = 180
y = 180 - 137
y = 43
