In $\odot( O , r),$ minor $\widehat{ ACB }$ subtends an angle of measure $72$ at the centre. Then, the ratio of the length of minor $\widehat{A C B}$ and the circumference of the circle is ............
In $\odot( O , r),$ minor $\widehat{ ACB }$ subtends an angle of measure $72$ at the centre. Then, the ratio of the length of minor $\widehat{A C B}$ and the circumference of the circle is ............
- A
$1:5$
- B
$1:6$
- C
$1:8$
- D
$1:9$
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