1.

A circle with area \[{{A}_{1}}\] is contained in the interior of a larger circle with area \[{{A}_{1}}+{{A}_{2}}.\] If the radius of the larger circle is 3 units and \[{{A}_{1}},{{A}_{2}},{{A}_{1}}+{{A}_{2}}\]are in A.P., then the radius of the smaller circle is ___.

A. \[\sqrt{2}\] units
B. 1 unit
C. 2 units
D. \[\sqrt{3}\] units
Answer» E.


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