Question

plz say the answer of this question class 9 CBSE maths​

Answer 1

Step-by-step explanation:

∠ABC = 69°, ∠ACB = 31°   [Given]

In ΔABC

∠ABC + ∠ACB + ∠BAC = 180°

⇒ ∠BAC  = 180° - ∠ABC - ∠ACB

⇒ ∠BAC  = 180° -  69° - 31° = 80°

∠BDC = ∠BAC  ( Angle drawn from same chord) 

∴ ∠BDC = 80°

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