Question

Berpa sudutnyaa x ....

Answer 1

Segitiga BCD
BC // CD
• sudut DBC = sudut CDB = m

180° = sdt C + sudut B + Sudut D
180° = 120° + m + m
180° - 120° = 2m
2m = 60°
m = 30° = sudut CDB = DBC

sudut CDA = sudut ADB + sudut CDB
60° = x + 30°
x = 60° - 30°
x = 30°