question_answer

The radius of a circle is 20 cm. Three more concentric circles are drawn inside it in such a manner that it is divided into four parts of equal area. Find the radius of one of the three concentric circles.

A)  \[8\sqrt{3}\,cm\]                           

B)  \[2\sqrt{3}\,cm\]

C)  \[10\sqrt{3}\,cm\]         

D)         \[14\sqrt{3}\,cm\]