Besar sudut CAD adalah.... A. 36 B. 42 C. 58 D. 84 mohon bantu jawab

ΔABD sama kaki : AD = DB sehingga
∠DAB = ∠ABD = x

∠ADB = 180° - 96°
∠ADB = 84°

∠ADB + ∠DAB + ∠ABD = 180°
84° + x + x = 180°
2x = 96°
x = 48°

ΔABC sama kaki : AB = AC sehingga
∠ACB = ∠ABC = 48° (∠ABD)

∠ABC + ∠ACB + ∠CAB = 180°
48° + 48° + ∠CAB = 180°
∠CAB = 180° - 48° - 48°
∠CAB = 84°

∠CAB = ∠CAD + ∠DAB
84° = ∠CAD + 48°
∠CAD = 84° - 48°
∠CAD = 36°