The radius of the circle whose arc of length $15\,cm$ makes an angle of $3/4$ radian at the centre is .....$cm$
The radius of the circle whose arc of length $15\,cm$ makes an angle of $3/4$ radian at the centre is .....$cm$
- A
$10$
- B
$20$
- C
$11\frac{1}{4}$
- D
$22\frac{1}{2}$
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