the difference between the radi of the smaller circle and the bigger circle is 7cm and the difference between the area of two circles is 1078sq.cm radius of the smaller circle is---------?

28cm

21cm

none of these

17.5cm

the difference between the radi of the smaller circle and the bigger circle is 7cm and the difference between the area of two circles is 1078sq.cm radius of the smaller circle is---------?

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