Q 16 ans 9.3 cm
Please answer fast no links
 

16.    Find the area enclosed between two concentric circles of radii 3.5 cm and 7 cm. A third concentric circle is drawn outside the 7 cm circle so that the area enclosed between it and the 7 cm circle is the same as that between the two inner circles. Find the radius of the third circle, correct to one decimal place .

$\left(Takes \mathrm{\pi } = \frac{22}{7}\right)$                                                                                                                                 (ICSE)