If from a circular sheet of paper of rad...

If from a circular sheet of paper of radius 15 c, a sector of `144^(@)` is removed and the remaining is used to make a conical surface, then the angle at the vertex will be :

`sin^-1 (3/(10))`

`sin^-1 (6/5)`

`2sin^-1 (3/5)`

`2sin^-1 (4/5)`

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