1.

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 :

Answer»

`sin^(-1)((3)/(10))`
`sin^(-1)((6)/(5))`
` 2sin^(-1)((3)/(5))`
`2 sin^(-1)((4)/(5))`

Answer :C


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