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---------?

none of these

21cm

17.5cm

28cm

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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