The length of minor $\widehat{ AB }$ of a circle is $\frac{1}{4}$ th of its circumference, then the measure of the angle subtended by minor $\widehat{ AB }$ at the centre will be $\ldots .$
The length of minor $\widehat{ AB }$ of a circle is $\frac{1}{4}$ th of its circumference, then the measure of the angle subtended by minor $\widehat{ AB }$ at the centre will be $\ldots .$
- A
$30$
- B
$45$
- C
$90$
- D
$60$
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