А
D
50°
B
с
O 25°
O 30°
O
100°
O 50°

Answer:
∠ CBA = 100°
Step-by-step explanation:
Since BD bisects ∠ CBA , then
∠ ABD = ∠ CBD = 50°
∠ CBA = ∠ CBD + ∠ ABD = 50° + 50° = 100°