In the adjacent figure ( not to scale), O is the centre of the circle and `/_OBA =30^(@)`. Find `/_ ACB`.
The following sentences ae the steps involved in solving the above problem. Arrange them in sequential order from the first to the last.

(A) `/_OAB =30^(@), /_ OBA =30^(@)`
`implies /_ AOB =180^(@) -30^(@)-30^(@) =120^(@)`
(B) We known that `/_ ACD =("Reflex "/_AOB)/(2)=(240^(@))/(2)=120^(@)`
(C ) Reflex `/_ AOB =240^(@)`
(D ) `OA =OB` (radii) `implies /_ OBA= /_ OAB =30^(@)`.

Options

A. ABCD
B. DCAB
C. DACB
D. DCA

Answer

C

Explanation

`(D),(A),(C ) ` and `(B)` is the sequenctial order.