1.

The radius of a circle is 20 cm. The radii (in cm) of three concentric circles drawn in such a manner that the whole area is divided into four equal parts, are :

Answer»

`20sqrt2,20sqrt3,20`
`(10sqrt3)/3`, (10sqrt2)/3, 10/3`
`10sqrt3, 10sqrt2, 10`
17, 14, 9

Answer :C


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