What is the value of ∠BDC if ∠BAC: ∠ABC = 4 : 5 and O is the centre of circle?

What is the value of ∠BDC if ∠BAC: ∠ABC = 4 : 5 and O is the ce

1.	What is the value of ∠BDC if ∠BAC: ∠ABC = 4 : 5 and O is the centre of circle?
A.	40°
B.	10°
C.	90°
D.	55°
Answer» B. 10°