Question

The radius of a circle is 20 cm. The radio of its three internally concentric circles drawn in such a manner that it's area is divided into four equal areas, is:
$(a) \: 20 \sqrt{2}, \: 20 \sqrt{3}, \: 10 \\ (b) \: \frac{10 \sqrt{3} }{3} ,\: \frac{10 \sqrt{2} }{3} , \: \frac{10}{3} \\ (c) \: 10 \sqrt{3} , \: 10 \sqrt{2} , \: 10 \: \\ (d) \: 17 ,\:14 , \: 10$
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Answer 1

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