The radius of the circle whose are of le...

The radius of the circle whose are of length `15\ pi` cm makes an angle of `3pi//4` radius at the centre is `10\ c m` b. `20\ c m` c. `11 1/4c m` d. `22 1/2c m`

`10 cm`

`20 cm`

`11(1)/(4)cm`

`22(1)/(2)cm`

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