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In a certain unit , the radius of gyrati...

In a certain unit , the radius of gyration of a uniform disc about its central and transverse axis is `sqrt (2.5)`. Its radius of gyration about a tangent in its plane (in the same unit ) must be

A

`sqrt(5)`

B

2.5

C

`root (2) (2.5)`

D

`sqrt (12.5)`

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