Question

Find the value of y



60°

80°

40°

None of these

​

Answer 1

Step-by-step explanation:

In ∠ABC,

∠ABC + ∠ACB + ∠BAC = 180°

69° + 31° + ∠BAC = 180°

∠BAC = 180° - 100°

∠BAC = 80°

But ∠BAC = ∠BDC (Angles in the same segment of a circle are equal)

Hence, ∠BDC = 80°