In $\odot( O , r),$ chord $\overline{ AB }$ subtends a right angle at the centre. The area of minor segment $\overline{ AB } \cup \widehat{ ACB }$ is $114\,cm ^{2}$ and the area of $\Delta OAB$ is $200\,cm ^{2} .$ Then, the area of minor sector $OACB$ is ......... $cm ^{2}$.
In $\odot( O , r),$ chord $\overline{ AB }$ subtends a right angle at the centre. The area of minor segment $\overline{ AB } \cup \widehat{ ACB }$ is $114\,cm ^{2}$ and the area of $\Delta OAB$ is $200\,cm ^{2} .$ Then, the area of minor sector $OACB$ is ......... $cm ^{2}$.
- A
$200$
- B
$86$
- C
$314$
- D
$228$
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