The angle subtended at the centre of a circle of radius $3$ metres by an arc of length $1$ metre is equal to
The angle subtended at the centre of a circle of radius $3$ metres by an arc of length $1$ metre is equal to
- A
$20°$
- B
$60°$
- C
$\frac{1}{3}$ radian
- D
$3$ radians
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